Tra - Level 2 CERT - Tech And Safety

1. When is it permissible to consume alcohol when prepping or launching high power rockets?

When the preparation is done the day before the launch

If the blood alcohol level is below the “impaired” level

It is never permitted

Consuming alcohol when prepping or launching high power rockets is never permitted due to the potential risks and dangers involved. Alcohol impairs judgment, coordination, and reaction time, which can lead to accidents and mishaps during the preparation or launch process. Safety is of utmost importance in rocketry, and any form of impairment, including alcohol consumption, is strictly prohibited to ensure the well-being of individuals and the success of the mission.

Explanation

Consuming alcohol when prepping or launching high power rockets is never permitted due to the potential risks and dangers involved. Alcohol impairs judgment, coordination, and reaction time, which can lead to accidents and mishaps during the preparation or launch process. Safety is of utmost importance in rocketry, and any form of impairment, including alcohol consumption, is strictly prohibited to ensure the well-being of individuals and the success of the mission.

2. What organizations may currently certify users of high power rocket motors include:

Tripoli Rocketry Association (TRA) and the National Association of Rocketry (NAR) only

The Bureau of Alcohol, Tobacco, Firearms, and Explosives (BATFE)

TRA, NRA the Canadian Association of Rocketry (CAR) and the United Kingdom Rocketry Association (UKRA)

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Explanation

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3. How does Newton’s third law “to every action there is always an equal and opposite reaction” relate to rocketry?

That the blast deflector must be strong enough to push the rocket off the launch pad at ignition

That a rocket flies because the rocket motor “pushes” the rocket in a direction opposite of the exhaust jet

That the thrust of a rocket motor is proportional to the air density at the launch site

The rocket motor's thrust causes the rocket to accelerate in the direction opposite the motor's thrust. Thus a rocket motor pushes only on the rocket, not on the air or launch pad

Explanation

The rocket motor's thrust causes the rocket to accelerate in the direction opposite the motor's thrust. Thus a rocket motor pushes only on the rocket, not on the air or launch pad

4. The center of pressure (CP) of a rocket is generally defined as:

The balance point of the rocket without the motor

The total area of the fins, airframe and nose cone divided by two

The point at which aerodynamic lift on a rocket is centered

The center of pressure (CP) is the point on the rocket where the aerodynamic lift is centered. This means that aerodynamic lift, if the rocket is at a non-sero angle of attack, forward of this point is balanced by the aerodynamic lift aft of this point.

Explanation

The center of pressure (CP) is the point on the rocket where the aerodynamic lift is centered. This means that aerodynamic lift, if the rocket is at a non-sero angle of attack, forward of this point is balanced by the aerodynamic lift aft of this point.

5. How can a statically unstable rocket be made stable?

Using a heavier motor

Adding weight to the nose

Making the rocket shorter

Adding enough weight to the nose will shift the center of gravity (CG) forward of the center of pressure (CP).

Explanation

Adding enough weight to the nose will shift the center of gravity (CG) forward of the center of pressure (CP).

6. What are three methods used to shift center of gravity (CG) of a rocket forward?

Add weight to the nose, make the rocket longer, install the number of fins

Add weight to the nose, make the rocket longer, use a smaller (or lighter) motor

Add weight to the nose, make the rocket shorter, use a smaller motor

Moving the CG forward requires judicious design changes. The following are given as "rules of thumb": Adding weight to the nose moves the CG forward by counterbalancing the rocket. Think of the rocket as a lever; making the rocket longer shifts the CG forward by making the lever longer. Using a smaller (or lighter) motor reduces the weight aft thus shifting the CG forward.

Explanation

Moving the CG forward requires judicious design changes. The following are given as "rules of thumb": Adding weight to the nose moves the CG forward by counterbalancing the rocket. Think of the rocket as a lever; making the rocket longer shifts the CG forward by making the lever longer. Using a smaller (or lighter) motor reduces the weight aft thus shifting the CG forward.

7. What happens to the coefficient of drag (Cd) as the rocket approaches the speed of sound?

The Cd decreases

The Cd stays the same

The Cd increases

As the rocket approaches the speed of sound, the coefficient of drag (Cd) increases. This is because at high speeds, the air resistance on the rocket becomes more significant, causing an increase in drag. The Cd is a measure of the aerodynamic efficiency of an object, and as the speed increases, the Cd value also increases. This means that the rocket experiences more air resistance and requires more force to overcome it, making it less efficient in terms of aerodynamics.

Explanation

As the rocket approaches the speed of sound, the coefficient of drag (Cd) increases. This is because at high speeds, the air resistance on the rocket becomes more significant, causing an increase in drag. The Cd is a measure of the aerodynamic efficiency of an object, and as the speed increases, the Cd value also increases. This means that the rocket experiences more air resistance and requires more force to overcome it, making it less efficient in terms of aerodynamics.

8. The flight of a high power rocket can be separated into three portions; they are:

Ignition, burnout and peak altitude

Powered flight, un-powered ascent and peak altitude

Powered flight, un-powered ascent and descent

The correct answer is "Powered flight, un-powered ascent and descent". This explanation is based on the understanding of how a high power rocket operates during its flight. During the powered flight phase, the rocket's engines are ignited and provide thrust to propel the rocket upward. Once the engines burn out, the rocket continues to ascend due to its momentum, entering the un-powered ascent phase. Finally, during the descent phase, the rocket descends back to the ground without any active propulsion. Therefore, the flight of a high power rocket can be divided into these three portions.

Explanation

The correct answer is "Powered flight, un-powered ascent and descent". This explanation is based on the understanding of how a high power rocket operates during its flight. During the powered flight phase, the rocket's engines are ignited and provide thrust to propel the rocket upward. Once the engines burn out, the rocket continues to ascend due to its momentum, entering the un-powered ascent phase. Finally, during the descent phase, the rocket descends back to the ground without any active propulsion. Therefore, the flight of a high power rocket can be divided into these three portions.

9. What is the function of the motor liner and the O-ring seals in a solid rocket motor?

To hold all of the parts in place prior to ignition of the rocket motor

To make the motor easier to clean if it is a reloadable motor

To keep the hot gasses of the motor from burning or melting the motor case

The function of the motor liner and the O-ring seals in a solid rocket motor is to keep the hot gases of the motor from burning or melting the motor case. These components act as a barrier, preventing the intense heat and pressure generated during ignition from damaging the structural integrity of the motor case. Without the motor liner and O-ring seals, the motor case would be susceptible to burning or melting, which could lead to catastrophic failure of the rocket motor.

Explanation

The function of the motor liner and the O-ring seals in a solid rocket motor is to keep the hot gases of the motor from burning or melting the motor case. These components act as a barrier, preventing the intense heat and pressure generated during ignition from damaging the structural integrity of the motor case. Without the motor liner and O-ring seals, the motor case would be susceptible to burning or melting, which could lead to catastrophic failure of the rocket motor.

10. What can happen is all the motors of a cluster do not ignite at launch?

Nothing the rocket is inherently stable

The rocket may not fly straight

The rocket will shred

If all the motors of a cluster do not ignite at launch, it can cause the rocket to lose balance and stability. Without the thrust from all motors, the rocket may veer off course and deviate from its intended flight path. This can result in an unstable and unpredictable trajectory, causing the rocket to not fly straight.

Explanation

If all the motors of a cluster do not ignite at launch, it can cause the rocket to lose balance and stability. Without the thrust from all motors, the rocket may veer off course and deviate from its intended flight path. This can result in an unstable and unpredictable trajectory, causing the rocket to not fly straight.

11. What is a shred?

A failure of the rocket air frame during boost resulting in destruction of the rocket

A failure of the recovery system during boost

A failure of the motor causing early ejection

The correct answer is a failure of the rocket air frame during boost resulting in destruction of the rocket. This means that a shred refers to the breaking or tearing apart of the rocket's air frame while it is in the process of boosting. This failure is severe enough to cause the complete destruction of the rocket. It could be due to structural weaknesses, excessive forces, or other factors that cause the rocket's structure to fail under the stress of the boost phase.

Explanation

The correct answer is a failure of the rocket air frame during boost resulting in destruction of the rocket. This means that a shred refers to the breaking or tearing apart of the rocket's air frame while it is in the process of boosting. This failure is severe enough to cause the complete destruction of the rocket. It could be due to structural weaknesses, excessive forces, or other factors that cause the rocket's structure to fail under the stress of the boost phase.

12. What is a cato?

A failure of the rocket resulting in failure of the airframe during boost

A failure of the recovery system during boost

A failure of the motor causing flight termination

The correct answer is a failure of the motor causing flight termination. This means that a cato refers to a failure of the rocket motor, which leads to the termination of the flight. It suggests that the motor malfunctioned or experienced a catastrophic failure, causing the rocket to stop functioning and the flight to be terminated.

Explanation

The correct answer is a failure of the motor causing flight termination. This means that a cato refers to a failure of the rocket motor, which leads to the termination of the flight. It suggests that the motor malfunctioned or experienced a catastrophic failure, causing the rocket to stop functioning and the flight to be terminated.

13. What is the primary requirement for the rocket motor ignitor?

It must transfer Sufficient heat to the propellant to assure ignition

It must produce hot, high velocity gasses to assure ignition

It must have a high resistance to be reliable

The primary requirement for the rocket motor ignitor is to transfer sufficient heat to the propellant to assure ignition. This is because the ignitor needs to generate enough heat to initiate the combustion process in the propellant, which in turn creates the necessary thrust for the rocket to take off. Without sufficient heat transfer, the propellant may not ignite properly, leading to a failed launch.

Explanation

The primary requirement for the rocket motor ignitor is to transfer sufficient heat to the propellant to assure ignition. This is because the ignitor needs to generate enough heat to initiate the combustion process in the propellant, which in turn creates the necessary thrust for the rocket to take off. Without sufficient heat transfer, the propellant may not ignite properly, leading to a failed launch.

14. What is the major obstacle in most duel-deployment rockets that use a drogue and a main parachute?

The drogue and the main can easily tangle if not properly arranged

The drogue slows the rocket too much and it drifts too far

The drogue does not slow the rocket enough and it lands hard

In most duel-deployment rockets that use a drogue and a main parachute, the major obstacle is the possibility of the drogue and the main parachute getting tangled if they are not properly arranged. This can lead to complications and failures during the descent and landing of the rocket.

Explanation

In most duel-deployment rockets that use a drogue and a main parachute, the major obstacle is the possibility of the drogue and the main parachute getting tangled if they are not properly arranged. This can lead to complications and failures during the descent and landing of the rocket.

15. What is the major issue with accelerometer-based altimeters?

They are larger, and usually much more expensive, the pressure-sensor altimeters

They do not have multiple capabilities such as duel deployment, ignition of airstarts, etc

The may not deploy properly if the flight is significantly non-vertical

Accelerometer-based altimeters rely on measuring acceleration to determine altitude. However, they may not deploy properly if the flight is significantly non-vertical, meaning if the flight path deviates from a straight vertical ascent or descent. This is because the accelerometer may not accurately measure the changes in altitude when the flight path is not vertical, leading to potential issues with the deployment of the altimeter.

Explanation

Accelerometer-based altimeters rely on measuring acceleration to determine altitude. However, they may not deploy properly if the flight is significantly non-vertical, meaning if the flight path deviates from a straight vertical ascent or descent. This is because the accelerometer may not accurately measure the changes in altitude when the flight path is not vertical, leading to potential issues with the deployment of the altimeter.

16. The design and construction of high power rocket motors, high power rocket vehicles and launch operations is detailed in what code?

NFPA 1122 and the Tripoli Safety Code

NFPA 1125 and the Tripoli Safety Code

NFPA 1127 and the Tripoli Safety Code

The correct answer is NFPA 1127 and the Tripoli Safety Code. NFPA 1127 is a code that specifically addresses the design and construction of high power rocket motors, high power rocket vehicles, and launch operations. The Tripoli Safety Code is another set of guidelines and regulations that focus on safety in high power rocketry. Both of these codes provide comprehensive information and standards for ensuring the safe design, construction, and operation of high power rockets.

Explanation

The correct answer is NFPA 1127 and the Tripoli Safety Code. NFPA 1127 is a code that specifically addresses the design and construction of high power rocket motors, high power rocket vehicles, and launch operations. The Tripoli Safety Code is another set of guidelines and regulations that focus on safety in high power rocketry. Both of these codes provide comprehensive information and standards for ensuring the safe design, construction, and operation of high power rockets.

17. What is the Authority Having Jurisdiction?

A court proceeding that rules on high power rocketry activities

The individual preparing a high power rocket for flight

The organization, office or individual responsible for approving equipment, an installation or procedure

The Authority Having Jurisdiction refers to the organization, office, or individual who has the responsibility and power to approve equipment, installations, or procedures. They have the authority to make decisions and ensure that everything complies with the relevant regulations and standards. This could include approving the use of certain equipment, granting permits for installations, or validating procedures to ensure safety and compliance.

Explanation

The Authority Having Jurisdiction refers to the organization, office, or individual who has the responsibility and power to approve equipment, installations, or procedures. They have the authority to make decisions and ensure that everything complies with the relevant regulations and standards. This could include approving the use of certain equipment, granting permits for installations, or validating procedures to ensure safety and compliance.

18. What is a complex high power rocket?

A rocket having more than one stage

A rocket having a cluster of rocket motors

Either a or b

A complex high power rocket refers to a rocket that either has more than one stage or a cluster of rocket motors. This means that it can have multiple sections or engines that work together to achieve high power and altitude. The rocket can be complex in terms of its design and functionality, requiring advanced engineering and technology.

Explanation

A complex high power rocket refers to a rocket that either has more than one stage or a cluster of rocket motors. This means that it can have multiple sections or engines that work together to achieve high power and altitude. The rocket can be complex in terms of its design and functionality, requiring advanced engineering and technology.

19. What is a high power rocket motor?

A rocket motor with more than 80 Newton-seconds of total impulse and 80 Newtons average thrust

A rocket motor with more than 160 Newton-seconds of total impulse or 80 Newtons average thrust

A rocket motor with more than 160 Newton-seconds of total impulse and 160 Newtons average thrust

A high power rocket motor is defined as a rocket motor with more than 160 Newton-seconds of total impulse or 80 Newtons average thrust. This means that it either has a total impulse greater than 160 Newton-seconds or an average thrust greater than 80 Newtons.

Explanation

A high power rocket motor is defined as a rocket motor with more than 160 Newton-seconds of total impulse or 80 Newtons average thrust. This means that it either has a total impulse greater than 160 Newton-seconds or an average thrust greater than 80 Newtons.

20. Who may operate a high power rocket?

Any member of a nationally recognized rocketry organization

Only those licensed by the federal government

A person that is a certified user

A person that is a certified user may operate a high power rocket. This implies that individuals who have undergone a certification process and have been deemed qualified and knowledgeable enough to handle high power rockets are allowed to operate them. This requirement ensures that only individuals with the necessary skills and understanding of safety protocols are permitted to operate these potentially dangerous devices.

Explanation

A person that is a certified user may operate a high power rocket. This implies that individuals who have undergone a certification process and have been deemed qualified and knowledgeable enough to handle high power rockets are allowed to operate them. This requirement ensures that only individuals with the necessary skills and understanding of safety protocols are permitted to operate these potentially dangerous devices.

21. What criteria apply to the construction of a high power Rocket?

Use suitable materials to withstand operating structural stresses and retain integrity in flight

Use only the lightest weight materials for the construction of high power rockets

Use materials that allow minimal flex of the rocket in flight

The construction of a high power rocket requires the use of suitable materials that can withstand the structural stresses and maintain integrity during flight. This is important because rockets are subjected to high forces and vibrations during launch and ascent. Using materials that are strong and durable ensures that the rocket can withstand these stresses without breaking or collapsing. Additionally, the materials should be able to retain their integrity in flight, meaning they should not degrade or weaken due to factors like temperature changes or exposure to atmospheric conditions.

Explanation

The construction of a high power rocket requires the use of suitable materials that can withstand the structural stresses and maintain integrity during flight. This is important because rockets are subjected to high forces and vibrations during launch and ascent. Using materials that are strong and durable ensures that the rocket can withstand these stresses without breaking or collapsing. Additionally, the materials should be able to retain their integrity in flight, meaning they should not degrade or weaken due to factors like temperature changes or exposure to atmospheric conditions.

22. When is it permissible to catch a high power rocket?

If the rocket weighs less than 2.2 pounds or 1kg

It is never permissible to catch a high power rocket

If the rocket is falling slowly enough that it is deemed not the be a hazard

Catching a high power rocket is never permissible because it can be dangerous and pose a risk to the person attempting to catch it. Rockets can reach high speeds and have the potential to cause serious injury or damage upon impact. It is safer to let the rocket fall to the ground or use other methods, such as a parachute or recovery system, to safely retrieve it.

Explanation

Catching a high power rocket is never permissible because it can be dangerous and pose a risk to the person attempting to catch it. Rockets can reach high speeds and have the potential to cause serious injury or damage upon impact. It is safer to let the rocket fall to the ground or use other methods, such as a parachute or recovery system, to safely retrieve it.

23. What payloads are not permitted in a high power rocket?

Payloads that are flammable or explosive or intended to cause harm

Vertebrate animals

Both a and b

Both a and b are not permitted as payloads in a high power rocket. This is because payloads that are flammable, explosive, or intended to cause harm pose a significant risk to the rocket and the surrounding environment. Similarly, vertebrate animals are not allowed as payloads due to ethical considerations and the potential harm they may experience during the rocket launch. Therefore, both a and b are not permitted in a high power rocket.

Explanation

Both a and b are not permitted as payloads in a high power rocket. This is because payloads that are flammable, explosive, or intended to cause harm pose a significant risk to the rocket and the surrounding environment. Similarly, vertebrate animals are not allowed as payloads due to ethical considerations and the potential harm they may experience during the rocket launch. Therefore, both a and b are not permitted in a high power rocket.

24. When shall the motor ignitor(s) be installed in a high power rocket motor?

At the launcher or a designated area

When the motor is installed in the rocket

Neither a nor b

The motor ignitor(s) should be installed at the launcher or a designated area. This is because installing the ignitor(s) before the motor is installed in the rocket could pose a safety risk, as it may accidentally ignite during transportation or handling. Therefore, it is important to wait until the motor is securely in place at the launcher or designated area before installing the ignitor(s) to ensure safe and controlled ignition of the rocket motor.

Explanation

The motor ignitor(s) should be installed at the launcher or a designated area. This is because installing the ignitor(s) before the motor is installed in the rocket could pose a safety risk, as it may accidentally ignite during transportation or handling. Therefore, it is important to wait until the motor is securely in place at the launcher or designated area before installing the ignitor(s) to ensure safe and controlled ignition of the rocket motor.

25. What is the maximum altitude allowed for flying high power rockets if there is a cloud ceiling of 3000 feet?

3500 feet

To the limited of the FAA waiver

Neither a nor b

The correct answer is "Neither a nor b". This means that the maximum altitude allowed for flying high power rockets is not 3500 feet, nor is it limited to the FAA waiver. The question implies that the cloud ceiling is at 3000 feet, but it does not provide any information about the maximum altitude allowed. Therefore, we cannot determine the correct answer based on the given information.

Explanation

The correct answer is "Neither a nor b". This means that the maximum altitude allowed for flying high power rockets is not 3500 feet, nor is it limited to the FAA waiver. The question implies that the cloud ceiling is at 3000 feet, but it does not provide any information about the maximum altitude allowed. Therefore, we cannot determine the correct answer based on the given information.

26. When may a solid propellant high power rocket motor be shipped and stored with the ignitor installed?

It is never permissible to ship or store a solid propellant high power rocket motor with the ignitor is place

When the rocket will be launched within 48 hours of ignitor installation

Neither a nor b

A solid propellant high power rocket motor should never be shipped or stored with the ignitor installed. This is because having the ignitor in place increases the risk of accidental ignition or premature firing, which can be extremely dangerous. Therefore, it is always necessary to remove the ignitor before shipping or storing the rocket motor.

Explanation

A solid propellant high power rocket motor should never be shipped or stored with the ignitor installed. This is because having the ignitor in place increases the risk of accidental ignition or premature firing, which can be extremely dangerous. Therefore, it is always necessary to remove the ignitor before shipping or storing the rocket motor.

27. Who may receive a solid propellant high power rocket motor?

A certified user

Any member of a nationally recognized rocketry organization

Any person over the age of 18

A certified user may receive a solid propellant high power rocket motor because they have undergone specific training and certification to handle and operate such equipment safely. This ensures that they have the necessary knowledge and skills to handle the potential risks associated with high power rocket motors.

Explanation

A certified user may receive a solid propellant high power rocket motor because they have undergone specific training and certification to handle and operate such equipment safely. This ensures that they have the necessary knowledge and skills to handle the potential risks associated with high power rocket motors.

28. What document has been adopted by the Tripoli Rocketry Association as The Tripoli Safety Code?

NFPA 1127

NFPA 1125

NFPA 1122

The Tripoli Rocketry Association has adopted NFPA 1127 as The Tripoli Safety Code.

Explanation

The Tripoli Rocketry Association has adopted NFPA 1127 as The Tripoli Safety Code.

29. For a subsonic rocket, what factors most greatly affect the coefficient of drag (Cd)?

Motor thrust, body diameter, nosecone shape and fin shape

Speed, airframe dimensions, nosecone shape and fin shape

Gravity, airframe dimensions, nosecone shape and fin shape

The coefficient of drag (Cd) is a measure of the resistance an object experiences as it moves through a fluid, in this case, air. In the context of a subsonic rocket, the factors that most greatly affect Cd are speed, airframe dimensions, nosecone shape, and fin shape. Speed affects Cd because as the rocket moves faster, the air resistance increases. Airframe dimensions, nosecone shape, and fin shape also impact Cd as they determine the overall shape and surface area of the rocket, which affects how the air flows around it.

Explanation

The coefficient of drag (Cd) is a measure of the resistance an object experiences as it moves through a fluid, in this case, air. In the context of a subsonic rocket, the factors that most greatly affect Cd are speed, airframe dimensions, nosecone shape, and fin shape. Speed affects Cd because as the rocket moves faster, the air resistance increases. Airframe dimensions, nosecone shape, and fin shape also impact Cd as they determine the overall shape and surface area of the rocket, which affects how the air flows around it.

30. The average thrust of a rocket motor is 100 Newtons and the burn time is 4 seconds. What is the total impulse?

25 Newton-seconds

400 Newton-seconds

400 Newtons

The total impulse of a rocket motor can be calculated by multiplying the average thrust by the burn time. In this case, the average thrust is given as 100 Newtons and the burn time is 4 seconds. Therefore, the total impulse can be calculated as 100 Newtons * 4 seconds = 400 Newton-seconds.

Explanation

The total impulse of a rocket motor can be calculated by multiplying the average thrust by the burn time. In this case, the average thrust is given as 100 Newtons and the burn time is 4 seconds. Therefore, the total impulse can be calculated as 100 Newtons * 4 seconds = 400 Newton-seconds.

31. Rocket A weighs twice as much as rocket B. Both are descending at 20 feet per second. Which statement is true?

The two rockets have the same kinetic energy

Rocket A has twice the kinetic energy of rocket B.

Rocket A has four times the kinetic energy of rocket A

The kinetic energy of an object is given by the equation KE = 0.5 * m * v^2, where m is the mass of the object and v is its velocity. In this case, Rocket A weighs twice as much as Rocket B, so its mass is twice that of Rocket B. Since both rockets are descending at the same velocity, the velocity term in the equation is the same for both rockets. Therefore, Rocket A has twice the mass of Rocket B, resulting in twice the kinetic energy.

Explanation

The kinetic energy of an object is given by the equation KE = 0.5 * m * v^2, where m is the mass of the object and v is its velocity. In this case, Rocket A weighs twice as much as Rocket B, so its mass is twice that of Rocket B. Since both rockets are descending at the same velocity, the velocity term in the equation is the same for both rockets. Therefore, Rocket A has twice the mass of Rocket B, resulting in twice the kinetic energy.

32. For a cluster rocket, which construction technique will minimize the effect of one motor failing to ignite?

Make the holes in the forward centering ring slightly closer to the rocket’s centerline than those of the aft centering right

Space the centering rings precisely one motor length apart

Use four smaller fins instead of three larger fins

By making the holes in the forward centering ring slightly closer to the rocket's centerline than those of the aft centering ring, the effect of one motor failing to ignite can be minimized. This construction technique ensures that the rocket's balance and stability are maintained even if one motor fails to ignite. By shifting the center of gravity slightly towards the centerline, the rocket will be less likely to veer off course or become unstable in the event of a motor failure.

Explanation

By making the holes in the forward centering ring slightly closer to the rocket's centerline than those of the aft centering ring, the effect of one motor failing to ignite can be minimized. This construction technique ensures that the rocket's balance and stability are maintained even if one motor fails to ignite. By shifting the center of gravity slightly towards the centerline, the rocket will be less likely to veer off course or become unstable in the event of a motor failure.

33. When is a recovery device not necessary in a high power rocket?

When the high power rocket is intended for ballistic flight

When the rocket has a bursting charge

A recovery device is always necessary

A recovery device is always necessary because it helps to bring the rocket safely back to the ground after launch. Without a recovery device, the rocket would continue to ascend and eventually crash back to the ground, causing damage and potentially injuring people or property. Therefore, regardless of whether the rocket is intended for ballistic flight or has a bursting charge, a recovery device is essential for a safe and controlled descent.

Explanation

A recovery device is always necessary because it helps to bring the rocket safely back to the ground after launch. Without a recovery device, the rocket would continue to ascend and eventually crash back to the ground, causing damage and potentially injuring people or property. Therefore, regardless of whether the rocket is intended for ballistic flight or has a bursting charge, a recovery device is essential for a safe and controlled descent.

34. A high power rocket may be constructed of what materials?

Paper, wood, fiberglass or plastic with a minimum amount of metallic parts

Paper, wood fiberglass, plastic and aluminum

There are no restrictions on construction materials

A high power rocket may be constructed of materials such as paper, wood, fiberglass, or plastic with a minimum amount of metallic parts. This is because these materials are lightweight and can withstand the high pressures and forces experienced during rocket flight. Metallic parts are generally avoided to reduce weight and increase overall performance.

Explanation

A high power rocket may be constructed of materials such as paper, wood, fiberglass, or plastic with a minimum amount of metallic parts. This is because these materials are lightweight and can withstand the high pressures and forces experienced during rocket flight. Metallic parts are generally avoided to reduce weight and increase overall performance.

35. What operating clearances must be complied with for flying high power rockets?

NFPA 1122, NFPA 1127 and Federal Aviation Administration Regulation Part 101

NFPA 1127, Federal Aviation Administration Regulation Part 101 and applicable federal, state and local regulations

NFPA 1122, Federal Aviation Administration Regulation Part 101 and applicable federal, state and local regulations

The correct answer is NFPA 1127, Federal Aviation Administration Regulation Part 101 and applicable federal, state and local regulations. This answer states that for flying high power rockets, one must comply with NFPA 1127, which is the National Fire Protection Association standard for high power rocketry. Additionally, compliance with Federal Aviation Administration Regulation Part 101 is required, as well as any relevant federal, state, and local regulations. These regulations ensure safety and proper operation of high power rockets.

Explanation

The correct answer is NFPA 1127, Federal Aviation Administration Regulation Part 101 and applicable federal, state and local regulations. This answer states that for flying high power rockets, one must comply with NFPA 1127, which is the National Fire Protection Association standard for high power rocketry. Additionally, compliance with Federal Aviation Administration Regulation Part 101 is required, as well as any relevant federal, state, and local regulations. These regulations ensure safety and proper operation of high power rockets.

36. When must the stability of a rocket be determined?

If the safety monitor requires it

Whenever the rocket is prepared for flight

Both a and b

The stability of a rocket must be determined both when the safety monitor requires it and whenever the rocket is prepared for flight. This is because ensuring the stability of the rocket is crucial for a safe and successful launch. The safety monitor may have specific requirements or guidelines that need to be followed to guarantee the rocket's stability. Additionally, it is essential to assess the stability of the rocket before every flight to account for any changes or adjustments made during the preparation process. Therefore, determining the stability of a rocket is necessary in both scenarios mentioned.

Explanation

The stability of a rocket must be determined both when the safety monitor requires it and whenever the rocket is prepared for flight. This is because ensuring the stability of the rocket is crucial for a safe and successful launch. The safety monitor may have specific requirements or guidelines that need to be followed to guarantee the rocket's stability. Additionally, it is essential to assess the stability of the rocket before every flight to account for any changes or adjustments made during the preparation process. Therefore, determining the stability of a rocket is necessary in both scenarios mentioned.

37. What are the elements of an ignition system?

Remotely controlled, electrically operated, a launch switch that returns to OFF when released

Remotely controlled, electrically operated and a removable safety interlock in series with the launch switch

Remotely controlled, electrically operated, a launch system that returns to OFF when released and a removable safety interlock in series with the launch switch

The elements of an ignition system include a remotely controlled, electrically operated launch system that returns to OFF when released and a removable safety interlock in series with the launch switch. These components work together to ensure the safe and controlled operation of the ignition system. The remote control allows for convenient operation from a distance, while the electrical operation ensures efficient and reliable ignition. The launch system returning to OFF when released helps prevent accidental or unintended ignition, and the removable safety interlock adds an extra layer of protection by requiring the interlock to be removed before the ignition system can be activated.

Explanation

The elements of an ignition system include a remotely controlled, electrically operated launch system that returns to OFF when released and a removable safety interlock in series with the launch switch. These components work together to ensure the safe and controlled operation of the ignition system. The remote control allows for convenient operation from a distance, while the electrical operation ensures efficient and reliable ignition. The launch system returning to OFF when released helps prevent accidental or unintended ignition, and the removable safety interlock adds an extra layer of protection by requiring the interlock to be removed before the ignition system can be activated.

38. When may a high power rocket be launched?

After warning the spectators and giving a 5 second countdown

When all systems are ready and after a 5 second countdown

After informing and getting permission and attention from the safety monitor

A high power rocket may be launched after informing and getting permission and attention from the safety monitor. This is important to ensure that all necessary precautions have been taken and that the launch can be conducted safely. The safety monitor is responsible for overseeing the launch and ensuring that all systems are ready and that the spectators have been warned. The 5 second countdown is likely included to provide a final warning before the rocket is launched.

Explanation

A high power rocket may be launched after informing and getting permission and attention from the safety monitor. This is important to ensure that all necessary precautions have been taken and that the launch can be conducted safely. The safety monitor is responsible for overseeing the launch and ensuring that all systems are ready and that the spectators have been warned. The 5 second countdown is likely included to provide a final warning before the rocket is launched.

39. What is the minimum distance for smoking (or open flames) from a high power rocket motors, motor reloading kits, and pyrotechnic modules?

10 feet

25 feet

There is no minimum distance

The correct answer is 25 feet. This is the minimum distance required for smoking or open flames to be kept away from high power rocket motors, motor reloading kits, and pyrotechnic modules. This distance is important to ensure safety and prevent any potential accidents or fires.

Explanation

The correct answer is 25 feet. This is the minimum distance required for smoking or open flames to be kept away from high power rocket motors, motor reloading kits, and pyrotechnic modules. This distance is important to ensure safety and prevent any potential accidents or fires.

40. Which of newton’s laws best describes the behavior of a rocket motor

Newton’s first law: A body continues in its state of rest or of uniform motion in a straight line unless it is compelled to change that state by forces impressed upon it,

Newton’s second law: The rate of change of momentum is proportional to the force impressed and is in the same direction as that force.

Newton’s third law: To every action there is always an equal and opposite reaction.

Newton's third law. Applying force in one direction always results in an equal force in an oppssite direction

Explanation

Newton's third law. Applying force in one direction always results in an equal force in an oppssite direction

41. What are the three forces action upon a rocket during the course of its flight?

Thrust, Rocket Diameter and finish

Nose cone shape, thrust and drag

Gravity, thrust and aerodynamic drag

Gravity, thrust and drag are the forces acting on a rocket

Explanation

Gravity, thrust and drag are the forces acting on a rocket

42. For an inherently stable rocket, which statement about the center of gravity (CG) four inches behind the center of pressure (CP). Is this a rocket likely to be stable?

The CG must be behind the CP relative to the desired direction of flight

The CG must be forward of the CP relative to the desired direction of flight

The CG must move forward (in the desired direction of flight) during the motor burn

The center of pressure (CP) is where the aerodynamic lift, due to the rocket being at a non-zero angle of attack, is centered. For an aerodynamically stable rocket with the CP behind the center of gravity (CG), the lift which is centered aft of the CG will create a corrective moment to return the rocket to zero degrees angle of attack. Conversely, if the CP is ahead of the CG the lift will attempt to turn the rocket around so that the CP will again be ahead of the CG. This resultant "tumbling" is characteristic of an unstable rocket.

Explanation

The center of pressure (CP) is where the aerodynamic lift, due to the rocket being at a non-zero angle of attack, is centered. For an aerodynamically stable rocket with the CP behind the center of gravity (CG), the lift which is centered aft of the CG will create a corrective moment to return the rocket to zero degrees angle of attack. Conversely, if the CP is ahead of the CG the lift will attempt to turn the rocket around so that the CP will again be ahead of the CG. This resultant "tumbling" is characteristic of an unstable rocket.

43. Organizations that may certify high power rocket motors include

Tripoli Rocketry Association (TRA) and the National Association of Rocketry (NAR) only

The Bureau of Alcohol, Tobacco, Firearms, and Explosives (BATFE)

TRA, NRA the Canadian Association of Rocketry (CAR) and the United Kingdom Rocketry Association (UKRA)

Organizations that may certify high power rocket motors include the Tripoli Rocketry Association (TRA), the National Association of Rocketry (NAR), the Canadian Association of Rocketry (CAR), and the United Kingdom Rocketry Association (UKRA). These organizations have established certification processes and safety guidelines to ensure that high power rocket motors are manufactured and used safely. The Bureau of Alcohol, Tobacco, Firearms, and Explosives (BATFE) is not involved in certifying rocket motors, as their focus is primarily on regulating firearms and explosives.

Explanation

Organizations that may certify high power rocket motors include the Tripoli Rocketry Association (TRA), the National Association of Rocketry (NAR), the Canadian Association of Rocketry (CAR), and the United Kingdom Rocketry Association (UKRA). These organizations have established certification processes and safety guidelines to ensure that high power rocket motors are manufactured and used safely. The Bureau of Alcohol, Tobacco, Firearms, and Explosives (BATFE) is not involved in certifying rocket motors, as their focus is primarily on regulating firearms and explosives.

44. A 4” diameter rocket with its motor is determined to have the center of gravity (CG) four inches behind the center of pressure (CP). Is this rocket likely to be stable?

No, the CG should be at least two body diameters behind the CP

No, the CP must be behind the CG for the rocket to be stable

Yes, the CP is one body diameter in front of the CG

The rocket is not stable because if the rocket rotated around its center of gravity (CG), the greater aerodynamic force forward of the cg would cause the rocket to rotate even farther, resulting in an unstable flight

Explanation

The rocket is not stable because if the rocket rotated around its center of gravity (CG), the greater aerodynamic force forward of the cg would cause the rocket to rotate even farther, resulting in an unstable flight

45. What is the “rule-of-thumb” for a stable rocket?

That the center of gravity should be at least one body diameter in front of the center of pressure

That the center of gravity should be very nearly at the same point as the center of pressure

The rocket should balance near or at the center of gravity

Keeping the center of gravity (CG) one body diameter in front of the center of pressure (CP) typically allows an adaquate margin for rocket stability.

Explanation

Keeping the center of gravity (CG) one body diameter in front of the center of pressure (CP) typically allows an adaquate margin for rocket stability.

46. What effect does a boat tail have on a subsonic rocket’s coefficient of drag (Cd)?

No effect, a boat tail is only a cosmetic design feature

It incrases the Cd by changing the airflow over the fins

It decreases the Cd by reducing the base drag

A boat tail on a subsonic rocket reduces the base drag, which in turn decreases the coefficient of drag (Cd). Base drag is caused by the pressure difference between the front and rear ends of the rocket, and the boat tail helps to smooth out the airflow and minimize this pressure difference. As a result, the Cd is decreased, improving the rocket's aerodynamic performance.

Explanation

A boat tail on a subsonic rocket reduces the base drag, which in turn decreases the coefficient of drag (Cd). Base drag is caused by the pressure difference between the front and rear ends of the rocket, and the boat tail helps to smooth out the airflow and minimize this pressure difference. As a result, the Cd is decreased, improving the rocket's aerodynamic performance.

47. A bates grain has an essentially neutral thrust curve because:

Core burning motors always have a neutral

The area of burning propellant remains relatively constant

The core is centered in the propellant grain

The correct answer is that the area of burning propellant remains relatively constant. This means that as the propellant burns, the surface area of the burning propellant does not change significantly. This results in a thrust curve that is essentially neutral, meaning that the thrust produced remains relatively constant throughout the burn time. This is in contrast to other types of thrust curves, such as increasing or decreasing thrust curves, where the thrust produced changes significantly over time.

Explanation

The correct answer is that the area of burning propellant remains relatively constant. This means that as the propellant burns, the surface area of the burning propellant does not change significantly. This results in a thrust curve that is essentially neutral, meaning that the thrust produced remains relatively constant throughout the burn time. This is in contrast to other types of thrust curves, such as increasing or decreasing thrust curves, where the thrust produced changes significantly over time.

48. What is the most common oxidizer in commercially available high power composite solid rocket motors?

Ammonium Perchlorate

Ammonium Nitrate

Ammonium Chlorate

Ammonium perchlorate is the most common oxidizer in commercially available high power composite solid rocket motors. It is widely used due to its high oxygen content and stability. Ammonium perchlorate provides the necessary oxygen for the combustion process, allowing the rocket motor to generate thrust. It is a highly effective oxidizer and has been extensively tested and proven to be reliable and safe for use in solid rocket motors.

Explanation

Ammonium perchlorate is the most common oxidizer in commercially available high power composite solid rocket motors. It is widely used due to its high oxygen content and stability. Ammonium perchlorate provides the necessary oxygen for the combustion process, allowing the rocket motor to generate thrust. It is a highly effective oxidizer and has been extensively tested and proven to be reliable and safe for use in solid rocket motors.

49. What typically happens to a marginally stable rocket with a hybrid motor during the thrusting phase?

Nothing

The rocket may become more stable

The rocket may become less stable

During the thrusting phase, a marginally stable rocket with a hybrid motor may become less stable. This is because the thrust generated by the motor can cause changes in the rocket's center of gravity and center of pressure. If the center of gravity shifts too far forward or if the center of pressure moves rearward, the rocket's stability can be compromised. This can result in increased wobbling or even loss of control during flight.

Explanation

During the thrusting phase, a marginally stable rocket with a hybrid motor may become less stable. This is because the thrust generated by the motor can cause changes in the rocket's center of gravity and center of pressure. If the center of gravity shifts too far forward or if the center of pressure moves rearward, the rocket's stability can be compromised. This can result in increased wobbling or even loss of control during flight.

50. In general terms, the total impulse of a rocket motor can be described as:

The product of the average motor thrust and burn time

The product of the propellant weight and burn time

The product of the propellant weight and the motor thrust

The correct answer is the product of the average motor thrust and burn time. This is because the total impulse of a rocket motor is determined by how much force the motor produces (thrust) and how long it produces that force (burn time). By multiplying these two values together, we can calculate the total impulse generated by the motor.

Explanation

The correct answer is the product of the average motor thrust and burn time. This is because the total impulse of a rocket motor is determined by how much force the motor produces (thrust) and how long it produces that force (burn time). By multiplying these two values together, we can calculate the total impulse generated by the motor.

51. What is a Newton?

The amount of force required to accelerate one pound one foot per second per second

The amount of force required to accelerate one kg one foot per second per second

The amount of force required to accelerate one kg one meter per second per second

A Newton is the amount of force required to accelerate one kg one meter per second per second.

Explanation

A Newton is the amount of force required to accelerate one kg one meter per second per second.

52. Rocket A is descending at 10 feet per second, rocket B weights the same but is descending at 20 feet per second. Which statement is true?

The two rockets have the same kinetic energy

Rocket B has twice the kinetic energy of rocket A

Rocket B has four times the kinetic energy of rocket A

The kinetic energy of an object is given by the formula KE = 1/2 mv^2, where m is the mass and v is the velocity. Since both rockets have the same mass, the only difference is their velocities. Rocket B is descending at twice the speed of Rocket A, so its velocity is 20 feet per second compared to Rocket A's 10 feet per second. Plugging these values into the formula, we find that Rocket B has four times the kinetic energy of Rocket A.

Explanation

The kinetic energy of an object is given by the formula KE = 1/2 mv^2, where m is the mass and v is the velocity. Since both rockets have the same mass, the only difference is their velocities. Rocket B is descending at twice the speed of Rocket A, so its velocity is 20 feet per second compared to Rocket A's 10 feet per second. Plugging these values into the formula, we find that Rocket B has four times the kinetic energy of Rocket A.

53. What is the purpose of the launch rod, rail or tower?

To keep the rocket pointing in the right direction prior to flight

To control the rocket’s flight long enough to allow aerodynamic stability

Both a and b

The purpose of the launch rod, rail, or tower is to serve both functions mentioned in options a and b. It keeps the rocket pointing in the right direction before flight, ensuring that it takes off in the desired trajectory. Additionally, it helps control the rocket's flight for a sufficient duration to achieve aerodynamic stability. Therefore, the launch rod, rail, or tower fulfills both purposes simultaneously.

Explanation

The purpose of the launch rod, rail, or tower is to serve both functions mentioned in options a and b. It keeps the rocket pointing in the right direction before flight, ensuring that it takes off in the desired trajectory. Additionally, it helps control the rocket's flight for a sufficient duration to achieve aerodynamic stability. Therefore, the launch rod, rail, or tower fulfills both purposes simultaneously.

54. Most APCP (ammonium perchlorate composite propellant) rocket motors are central-burning rather than endburning:

Because more APCP has a specific impulse that is too low for endburning motors

Because most APCP has a burn rate that is too low for useful endburners

The premise is incorrect; most APCP are endburners

Most APCP rocket motors are central-burning rather than endburning because most APCP has a burn rate that is too low for useful endburners. This means that the rate at which the propellant burns is not fast enough to be effectively used in endburning motors. Central-burning motors, on the other hand, allow for a more controlled and efficient burn of the propellant.

Explanation

Most APCP rocket motors are central-burning rather than endburning because most APCP has a burn rate that is too low for useful endburners. This means that the rate at which the propellant burns is not fast enough to be effectively used in endburning motors. Central-burning motors, on the other hand, allow for a more controlled and efficient burn of the propellant.

55. What is generally covered in the scope of NFPA 1127?

Design and construction of commercial high power rocket motors, high power rocket vehicles and launch operations

Design and construction of all amateur high power rocket motors, high power rocket vehicles and launch operations

Design and construction of model and high power rocket motors, model and high power rocket vehicles and launch operations

NFPA 1127 generally covers the design and construction of commercial high power rocket motors, high power rocket vehicles, and launch operations. This means that the standards and guidelines outlined in NFPA 1127 are specifically applicable to commercial entities involved in the development, manufacturing, and operation of high power rockets. It does not cover amateur rocket motors or vehicles, or model rockets.

Explanation

NFPA 1127 generally covers the design and construction of commercial high power rocket motors, high power rocket vehicles, and launch operations. This means that the standards and guidelines outlined in NFPA 1127 are specifically applicable to commercial entities involved in the development, manufacturing, and operation of high power rockets. It does not cover amateur rocket motors or vehicles, or model rockets.

56. Who is exempt from NFPA 1127?

There are no exemptions to the NFPA 1127, everyone must comply

Federal, state and local government, colleges, universities and licensed for-profit business engaged in high power rocketry activities

Individuals manufacturing high power rocket motors for their own use and/or limited distribution

The correct answer is that federal, state, and local government entities, colleges, universities, and licensed for-profit businesses engaged in high power rocketry activities are exempt from NFPA 1127. This means that these entities do not have to comply with the regulations outlined in NFPA 1127 for their high power rocketry activities. However, individuals who manufacture high power rocket motors for their own use and/or limited distribution are not exempt and must still comply with NFPA 1127.

Explanation

The correct answer is that federal, state, and local government entities, colleges, universities, and licensed for-profit businesses engaged in high power rocketry activities are exempt from NFPA 1127. This means that these entities do not have to comply with the regulations outlined in NFPA 1127 for their high power rocketry activities. However, individuals who manufacture high power rocket motors for their own use and/or limited distribution are not exempt and must still comply with NFPA 1127.

57. Individuals, firms, partnerships, joint ventures, corporations or other business entities engaged in high power rocketry activities are exempt from NFPA 1127 until what point?

When flying high power rockets as part of a test program

When selling to qualified users in conformance with NFPA 1127

When engaged in commercial space activities

Individuals, firms, partnerships, joint ventures, corporations or other business entities engaged in high power rocketry activities are exempt from NFPA 1127 until they are selling to qualified users in conformance with NFPA 1127. This means that they are not required to comply with the regulations of NFPA 1127 when conducting high power rocketry activities for testing purposes or when engaged in commercial space activities. However, once they start selling their products to qualified users, they must adhere to the guidelines and standards set by NFPA 1127 to ensure safety and compliance.

Explanation

Individuals, firms, partnerships, joint ventures, corporations or other business entities engaged in high power rocketry activities are exempt from NFPA 1127 until they are selling to qualified users in conformance with NFPA 1127. This means that they are not required to comply with the regulations of NFPA 1127 when conducting high power rocketry activities for testing purposes or when engaged in commercial space activities. However, once they start selling their products to qualified users, they must adhere to the guidelines and standards set by NFPA 1127 to ensure safety and compliance.

58. What are the minimum criteria that defines a high power rocket?

A rocket with a single motor with more than 160 Newton-seconds total impulse or an installed impulse of 320 Newton-seconds and no more than 40,960 Newton-seconds

A rocket with a single motor having an average thrust in excess of 80 Newtons

Either a or b

A high power rocket can be defined by either having a single motor with more than 160 Newton-seconds total impulse or an installed impulse of 320 Newton-seconds and no more than 40,960 Newton-seconds, or by having a single motor with an average thrust in excess of 80 Newtons. In other words, a high power rocket can either have a high total impulse or a high average thrust.

Explanation

A high power rocket can be defined by either having a single motor with more than 160 Newton-seconds total impulse or an installed impulse of 320 Newton-seconds and no more than 40,960 Newton-seconds, or by having a single motor with an average thrust in excess of 80 Newtons. In other words, a high power rocket can either have a high total impulse or a high average thrust.

59. What is the Launch Site Dimensions Table used for?

For all high power rocket flights

When there is a question relating to the diameter of sides of the launching area

As the standard for minimum launch site dimensions

The Launch Site Dimensions Table is used as a standard for determining the minimum dimensions required for a launch site. It provides guidelines and specifications for the size and layout of the launching area. This ensures that there is enough space for safe and successful rocket launches, taking into consideration factors such as the diameter of the sides of the launching area. The table is particularly important for high power rocket flights, where safety and proper planning are crucial.

Explanation

The Launch Site Dimensions Table is used as a standard for determining the minimum dimensions required for a launch site. It provides guidelines and specifications for the size and layout of the launching area. This ensures that there is enough space for safe and successful rocket launches, taking into consideration factors such as the diameter of the sides of the launching area. The table is particularly important for high power rocket flights, where safety and proper planning are crucial.

60. What is the minimum distance from an occupied building or public highway for a launch site?

1000 feet

1500 feet

No minimum distance if the building occupants are informed of the activity

The minimum distance from an occupied building or public highway for a launch site is 1500 feet. This distance ensures the safety of the people in the building or on the highway by providing a sufficient buffer zone in case of any accidents or mishaps during the launch. It helps to minimize the risk of any potential damage or harm to the surrounding structures and individuals.

Explanation

The minimum distance from an occupied building or public highway for a launch site is 1500 feet. This distance ensures the safety of the people in the building or on the highway by providing a sufficient buffer zone in case of any accidents or mishaps during the launch. It helps to minimize the risk of any potential damage or harm to the surrounding structures and individuals.

61. Ammonium perchlorate composite propellant (APCP) reload modules and APCP high power rocket motors shall be stored in what type of container?

A Type 3 or Type 4 indoor/outdoor magazine

An airtight, reseal-able, non-combustible container

A container that provides reasonably safe storage for non-explosive flammable material

The correct answer is A container that provides reasonably safe storage for non-explosive flammable material. This is because ammonium perchlorate composite propellant (APCP) is a flammable material, but it is not explosive. Therefore, it should be stored in a container that can safely store flammable materials, but it does not need to be a specialized explosive storage container.

Explanation

The correct answer is A container that provides reasonably safe storage for non-explosive flammable material. This is because ammonium perchlorate composite propellant (APCP) is a flammable material, but it is not explosive. Therefore, it should be stored in a container that can safely store flammable materials, but it does not need to be a specialized explosive storage container.

62. A commercial manufacturer of high power rocket motors may produce what kind of motors?

Expendable, solid propellant high power rocket motors

Reloadable non-expandable solid propellant high power rocket motors

Either of the above

The correct answer is either of the above because a commercial manufacturer of high power rocket motors may choose to produce both expendable and reloadable non-expandable solid propellant motors. The choice depends on the specific requirements of the customer or mission.

Explanation

The correct answer is either of the above because a commercial manufacturer of high power rocket motors may choose to produce both expendable and reloadable non-expandable solid propellant motors. The choice depends on the specific requirements of the customer or mission.

63. When may a high power rocket motor be used for spectacular displays of color, light and/or sound?

When used in public display

When properly designed for that purpose

They may not be used for this application

High power rocket motors may not be used for spectacular displays of color, light, and/or sound. This suggests that these rocket motors are not designed or intended for such purposes. Therefore, using them for public displays or designing them specifically for this purpose would not be appropriate.

Explanation

High power rocket motors may not be used for spectacular displays of color, light, and/or sound. This suggests that these rocket motors are not designed or intended for such purposes. Therefore, using them for public displays or designing them specifically for this purpose would not be appropriate.

64. When is the sale, offering for sale and/or exposing for sale of uncertified motors permissible?

When the motors are not to be transported outside the state of manufacture

When the sale of motors are limited to certified users

It is never permitted

The correct answer is that the sale, offering for sale, and/or exposing for sale of uncertified motors is never permitted. This means that regardless of the circumstances, it is not allowed to sell or offer uncertified motors for sale.

Explanation

The correct answer is that the sale, offering for sale, and/or exposing for sale of uncertified motors is never permitted. This means that regardless of the circumstances, it is not allowed to sell or offer uncertified motors for sale.

65. Who in Tripoli may certify a member Level 1 or Level 2?

The Prefect

A TAP member

A member of the Board of Directors, The Prefect or a TAP member

A member of the Board of Directors, The Prefect, or a TAP member may certify a member Level 1 or Level 2 in Tripoli. This means that any of these individuals have the authority to validate and approve the certification of a member at either Level 1 or Level 2 in Tripoli.

Explanation

A member of the Board of Directors, The Prefect, or a TAP member may certify a member Level 1 or Level 2 in Tripoli. This means that any of these individuals have the authority to validate and approve the certification of a member at either Level 1 or Level 2 in Tripoli.

66. Who is allowed in the launch area at a Tripoli research launch?

Any invited person

Any member of TRA, NAR, CAR or UKRA

Any Tripoli member 18 years old or older

The launch area at a Tripoli research launch is only open to Tripoli members who are 18 years old or older. This means that any invited person or members of other organizations such as TRA, NAR, CAR, or UKRA are not allowed in the launch area.

Explanation

The launch area at a Tripoli research launch is only open to Tripoli members who are 18 years old or older. This means that any invited person or members of other organizations such as TRA, NAR, CAR, or UKRA are not allowed in the launch area.

67. You are at the launch site and decide to fly your rocket on a heavier motor than you simulated it on. Which statement regarding CG is true?

One can install a motor, recovery system and payload and determine the balance point of the rocket as it is ready for flight.

One can balance the rocket with the motor hardware alone because that is the condition of the rocket after motor burnout

It is not necessary to test for the center of gravity when using a heavier motor because it has more thrust

Measuring the center of gravity (CG) by balancing the rocket requires that the rocket be prepared as through ready for flight. It is especially important to check when using heavier motor than previously flown.

Explanation

Measuring the center of gravity (CG) by balancing the rocket requires that the rocket be prepared as through ready for flight. It is especially important to check when using heavier motor than previously flown.

68. What ordinarily happens to the center of gravity (CG) of a rocket during a solid rocket motor's thrusting phase?

The CG stays the same

The CG shifts forward

The CG shifts aft

As the propellant burns the motor gets lighter and thus moves the balance point of center of gravity (CG) forward. This is why a marginally stable rocket may "act squirrelly" at launch, then stabilize and fly straight.

Explanation

As the propellant burns the motor gets lighter and thus moves the balance point of center of gravity (CG) forward. This is why a marginally stable rocket may "act squirrelly" at launch, then stabilize and fly straight.

69. The definition of coefficient of drag (Cd) is:

A dimensionless number that represents the effect of gravity and Mach number of the rocket

A dimensionless number dependent on the rocket configuration, Mach number and angle of attack

The force, in newton’s, exerted on the rocket by the atmosphere

The correct answer is "A dimensionless number dependent on the rocket configuration, Mach number and angle of attack." This answer accurately describes the definition of the coefficient of drag (Cd). The coefficient of drag is a dimensionless number that represents the resistance or drag experienced by an object moving through a fluid, such as air. It depends on various factors including the shape or configuration of the object (in this case, the rocket), the speed of the object (Mach number), and the angle at which the object is moving through the fluid (angle of attack).

Explanation

The correct answer is "A dimensionless number dependent on the rocket configuration, Mach number and angle of attack." This answer accurately describes the definition of the coefficient of drag (Cd). The coefficient of drag is a dimensionless number that represents the resistance or drag experienced by an object moving through a fluid, such as air. It depends on various factors including the shape or configuration of the object (in this case, the rocket), the speed of the object (Mach number), and the angle at which the object is moving through the fluid (angle of attack).

70. Which describes the thrust curve of a progressive motor?

A general decrease in thrust during the burn

A general increase in thrust during the burn

About the same thrust at ignition as at burnout

A progressive motor is designed to increase its thrust as the burn progresses. This means that as the motor burns, the thrust it produces gradually increases rather than decreases or stays the same. This type of thrust curve allows for a more efficient and controlled acceleration during the burn, making it suitable for applications that require a gradual increase in thrust.

Explanation

A progressive motor is designed to increase its thrust as the burn progresses. This means that as the motor burns, the thrust it produces gradually increases rather than decreases or stays the same. This type of thrust curve allows for a more efficient and controlled acceleration during the burn, making it suitable for applications that require a gradual increase in thrust.

71. What is NH4ClO4?

Ammonium Perchlorate

Ammonium Nitrate

Ammonium Chlorate

NH4ClO4 is the chemical formula for Ammonium Perchlorate. It is a white crystalline solid compound that is highly soluble in water. It is commonly used as an oxidizer in rocket propellants, fireworks, and airbag inflators. Ammonium Perchlorate is a strong oxidizing agent and can release oxygen when heated, making it suitable for various pyrotechnic applications.

Explanation

NH4ClO4 is the chemical formula for Ammonium Perchlorate. It is a white crystalline solid compound that is highly soluble in water. It is commonly used as an oxidizer in rocket propellants, fireworks, and airbag inflators. Ammonium Perchlorate is a strong oxidizing agent and can release oxygen when heated, making it suitable for various pyrotechnic applications.

72. Which of the motors listed below has the highest total impulse?

J200

J400

K200

The K200 motor has the highest total impulse among the listed motors. Total impulse is a measure of the total energy a motor can produce, and it is calculated by multiplying the average thrust of the motor by the burn time. Since the K200 motor has a higher average thrust and burn time compared to the J200 and J400 motors, it results in a higher total impulse.

Explanation

The K200 motor has the highest total impulse among the listed motors. Total impulse is a measure of the total energy a motor can produce, and it is calculated by multiplying the average thrust of the motor by the burn time. Since the K200 motor has a higher average thrust and burn time compared to the J200 and J400 motors, it results in a higher total impulse.

73. Which of the following has a total impulse (It) in the J motor range?

It = 600 Newton-seconds

It = 1000 Newton-seconds

It = 1290 Newton-seconds

The correct answer is It = 1000 Newton-seconds. This is because the question is asking for the total impulse in the J motor range, and the only option that falls within that range is 1000 Newton-seconds.

Explanation

The correct answer is It = 1000 Newton-seconds. This is because the question is asking for the total impulse in the J motor range, and the only option that falls within that range is 1000 Newton-seconds.

74. What is the purpose of a launch lug?

To add drag to the rocket at launch

To guide the rocket along the launch rod or rail

Both a and b

A launch lug serves the purpose of guiding the rocket along the launch rod or rail. It is a small tube or rod attached to the rocket's body, which slides onto the launch rod or rail during liftoff. This helps to keep the rocket stable and prevents it from veering off course during the initial stages of flight. By ensuring a straight and controlled ascent, the launch lug plays a crucial role in the safe and successful launch of the rocket.

Explanation

A launch lug serves the purpose of guiding the rocket along the launch rod or rail. It is a small tube or rod attached to the rocket's body, which slides onto the launch rod or rail during liftoff. This helps to keep the rocket stable and prevents it from veering off course during the initial stages of flight. By ensuring a straight and controlled ascent, the launch lug plays a crucial role in the safe and successful launch of the rocket.

75. What is the purpose of NFPA 1127 and the Tripoli Safety Code?

To provide safe and reliable motors, establish flight operations guidelines and prevent injury

To promote experimentation with propellant formulas, rocket design and payload systems

To prevent beginning high power hobbyists from making mistakes

NFPA 1127 and the Tripoli Safety Code serve the purpose of ensuring safety and reliability in the use of motors, establishing guidelines for flight operations, and preventing injury. These codes aim to promote responsible and safe practices in the field of rocketry, including the use of propellant formulas, rocket design, and payload systems. By providing a set of standards and regulations, these codes help to prevent accidents and mistakes, particularly among beginning high power hobbyists.

Explanation

NFPA 1127 and the Tripoli Safety Code serve the purpose of ensuring safety and reliability in the use of motors, establishing guidelines for flight operations, and preventing injury. These codes aim to promote responsible and safe practices in the field of rocketry, including the use of propellant formulas, rocket design, and payload systems. By providing a set of standards and regulations, these codes help to prevent accidents and mistakes, particularly among beginning high power hobbyists.

76. What is the lower weight limit of a high power rocket?

A rocket weighing more than 53 ounces

A rocket weighing less than 112 pounds

Both a and b

The correct answer is a rocket weighing more than 53 ounces. This means that the lower weight limit of a high power rocket is 53 ounces or above.

Explanation

The correct answer is a rocket weighing more than 53 ounces. This means that the lower weight limit of a high power rocket is 53 ounces or above.

77. What are the structural or load bearing parts of a high power rocket?

Nose cone, body tube and motor mount

Nose cone, body tube and fins

Nose cone, motor mount and fins

The structural or load bearing parts of a high power rocket are the nose cone, body tube, and fins. The nose cone is designed to reduce air resistance and protect the payload. The body tube provides structural support and houses the rocket's components. The fins stabilize the rocket during flight and help maintain its trajectory. These three components work together to ensure the stability and structural integrity of the rocket during launch and flight.

Explanation

The structural or load bearing parts of a high power rocket are the nose cone, body tube, and fins. The nose cone is designed to reduce air resistance and protect the payload. The body tube provides structural support and houses the rocket's components. The fins stabilize the rocket during flight and help maintain its trajectory. These three components work together to ensure the stability and structural integrity of the rocket during launch and flight.

78. What is the limit of the surface wind for launching a high power rocket?

30 MPH

20 MPH

15 MPH

The limit of the surface wind for launching a high power rocket is 20 MPH. This is because high winds can affect the stability and trajectory of the rocket, potentially causing it to veer off course or become unstable in flight. Launching in winds above this limit can pose a risk to the rocket and surrounding areas. Therefore, it is important to ensure that wind speeds are within the acceptable range before launching a high power rocket.

Explanation

The limit of the surface wind for launching a high power rocket is 20 MPH. This is because high winds can affect the stability and trajectory of the rocket, potentially causing it to veer off course or become unstable in flight. Launching in winds above this limit can pose a risk to the rocket and surrounding areas. Therefore, it is important to ensure that wind speeds are within the acceptable range before launching a high power rocket.

79. What variation is permitted in the certified total impulse and delay time of commercial high power rocket motors?

10%

20%

30%

Commercial high power rocket motors are subject to strict regulations to ensure safety. The certified total impulse and delay time of these motors can vary by up to 20% from the specified values. This allows for some flexibility in manufacturing and performance while still maintaining a reasonable level of consistency and reliability. A 20% variation provides a balance between accommodating minor deviations and ensuring that the motors meet the required standards for performance and safety.

Explanation

Commercial high power rocket motors are subject to strict regulations to ensure safety. The certified total impulse and delay time of these motors can vary by up to 20% from the specified values. This allows for some flexibility in manufacturing and performance while still maintaining a reasonable level of consistency and reliability. A 20% variation provides a balance between accommodating minor deviations and ensuring that the motors meet the required standards for performance and safety.

80. What are the three major factors that determine the maximum altitude of a high power rocket in vertical flight

Lift-off weight, propellant weight and motor thrust

Fin size, propellant weight and motor thrust

Motor thrust, weight and aerodynamic drag

The motor thrust, weight and aerodynamic drag are the primary forces considered when determining the altitude of a rocket. Please note that the weight of the rocket must consider the lift-off weight and the weight at burn-out to be complete

Explanation

The motor thrust, weight and aerodynamic drag are the primary forces considered when determining the altitude of a rocket. Please note that the weight of the rocket must consider the lift-off weight and the weight at burn-out to be complete

81. What are three methods used to shift the center of pressure (CP) aft?

Make the rocket shorter, use larger fins, increase the number of fins

Make the rocket shorter, use smaller fins, add weight to the nose

Make the rocket shorter, change the number of fins, use a longer launch rod

Moving the CP aft requires judicious design changes. The following are give as "rules of thumb": Adding weight to the nose move the CP aft. This can be accomplished by increasing the area on each fin and/or increasing the number of fins. The CP can also shifted aft by maing the rocket shorter. This alone is generally not preferred because the CG is also shifted aft and the CP/CG stability relationship may be compromised.

Explanation

Moving the CP aft requires judicious design changes. The following are give as "rules of thumb": Adding weight to the nose move the CP aft. This can be accomplished by increasing the area on each fin and/or increasing the number of fins. The CP can also shifted aft by maing the rocket shorter. This alone is generally not preferred because the CG is also shifted aft and the CP/CG stability relationship may be compromised.

82. Which describes the thrust curve of a regressive motor burn?

A high initial thrust relative to the ending thrust of the motor

A lower initial thrust relative to the ending thrust

The thrust curve is flat

A regressive motor burn refers to a type of rocket motor burn where the thrust decreases over time. In this case, the correct answer states that the thrust curve of a regressive motor burn has a high initial thrust relative to the ending thrust of the motor. This means that the motor starts with a strong initial thrust and gradually decreases in thrust as it burns.

Explanation

A regressive motor burn refers to a type of rocket motor burn where the thrust decreases over time. In this case, the correct answer states that the thrust curve of a regressive motor burn has a high initial thrust relative to the ending thrust of the motor. This means that the motor starts with a strong initial thrust and gradually decreases in thrust as it burns.

83. What is the oxidizer most commonly used in commercial hybrid rocket motor?

N2O

N2O4

NO2

N2O, also known as nitrous oxide or laughing gas, is the oxidizer most commonly used in commercial hybrid rocket motors. It is preferred due to its stability, ease of handling, and high performance characteristics. N2O is a self-pressurizing oxidizer, meaning it does not require a separate tank or pressurization system. It is also non-toxic and can be stored as a liquid at room temperature, making it a safe and practical choice for commercial applications.

Explanation

N2O, also known as nitrous oxide or laughing gas, is the oxidizer most commonly used in commercial hybrid rocket motors. It is preferred due to its stability, ease of handling, and high performance characteristics. N2O is a self-pressurizing oxidizer, meaning it does not require a separate tank or pressurization system. It is also non-toxic and can be stored as a liquid at room temperature, making it a safe and practical choice for commercial applications.

84. What is the nominal tank pressure of a nitrous oxide hybrid motor at 75F?

100 psi

750 psi

1500 psi

The nominal tank pressure of a nitrous oxide hybrid motor at 75F is 750 psi. This means that the pressure inside the tank is expected to be around 750 pounds per square inch at a temperature of 75 degrees Fahrenheit.

Explanation

The nominal tank pressure of a nitrous oxide hybrid motor at 75F is 750 psi. This means that the pressure inside the tank is expected to be around 750 pounds per square inch at a temperature of 75 degrees Fahrenheit.

85. A rocket with a motor cluster consisting of a central composite motor and four black powder motors, using five identical igniters:

Will result in all motors starting about the same time

Will result in the composite motor starting first followed by the black powder motors

Will result in the black powder motors starting first followed by the central composite motor

The correct answer is that the black powder motors will start first followed by the central composite motor. This is because black powder motors typically have a faster ignition time compared to composite motors. Therefore, when the igniters are activated simultaneously, the black powder motors will ignite and start burning before the composite motor.

Explanation

The correct answer is that the black powder motors will start first followed by the central composite motor. This is because black powder motors typically have a faster ignition time compared to composite motors. Therefore, when the igniters are activated simultaneously, the black powder motors will ignite and start burning before the composite motor.

86. Which of the motors listed below has the highest average thrust?

J200

J400

K200

The J400 motor has the highest average thrust among the motors listed.

Explanation

The J400 motor has the highest average thrust among the motors listed.

87. What is the difference between a J640 and j320 high power rocket motor (assume full 1280 Newton-second J motors)?

The J320 burns out twice as fast as the J640

There is no difference between the motors, the numbers are manufacturer reference only

The J640 burns out twice as fast as the J320

The J640 burns out twice as fast as the J320. This means that the J640 motor will reach its burnout point in half the time it takes for the J320 motor to burn out. The burnout time is a measure of how long the motor can sustain its thrust before it exhausts all its propellant. Therefore, the J640 motor will have a shorter burn time compared to the J320 motor.

Explanation

The J640 burns out twice as fast as the J320. This means that the J640 motor will reach its burnout point in half the time it takes for the J320 motor to burn out. The burnout time is a measure of how long the motor can sustain its thrust before it exhausts all its propellant. Therefore, the J640 motor will have a shorter burn time compared to the J320 motor.

88. What is the maximum weight of a high power rocket?

Less than maximum liftoff weight recommended by the motor manufacturer for a given motor

Less than 112 pounds or 50 kg

There is no maximum high power rocket weight

The correct answer is "Less than maximum liftoff weight recommended by the motor manufacturer for a given motor." This means that the maximum weight of a high power rocket should not exceed the weight recommended by the motor manufacturer for the specific motor being used. This is important because exceeding the recommended weight could lead to instability, decreased performance, or even failure of the rocket. It is crucial to follow the manufacturer's guidelines to ensure safe and successful rocket launches.

Explanation

The correct answer is "Less than maximum liftoff weight recommended by the motor manufacturer for a given motor." This means that the maximum weight of a high power rocket should not exceed the weight recommended by the motor manufacturer for the specific motor being used. This is important because exceeding the recommended weight could lead to instability, decreased performance, or even failure of the rocket. It is crucial to follow the manufacturer's guidelines to ensure safe and successful rocket launches.

89. When must a high power rocket launching device incorporate a blast deflector?

When necessary to prevent the rocket motor’s exhaust from impinging on flammable materials

All launch systems must incorporate a blast deflector

Both a and b

A high power rocket launching device must incorporate a blast deflector when it is necessary to prevent the rocket motor's exhaust from impinging on flammable materials. This is important to ensure the safety of the launch and prevent any potential accidents or fires caused by the rocket's exhaust. By using a blast deflector, the force and heat of the exhaust are directed away from any flammable materials, reducing the risk of ignition or damage. Therefore, the correct answer is when necessary to prevent the rocket motor's exhaust from impinging on flammable materials.

Explanation

A high power rocket launching device must incorporate a blast deflector when it is necessary to prevent the rocket motor's exhaust from impinging on flammable materials. This is important to ensure the safety of the launch and prevent any potential accidents or fires caused by the rocket's exhaust. By using a blast deflector, the force and heat of the exhaust are directed away from any flammable materials, reducing the risk of ignition or damage. Therefore, the correct answer is when necessary to prevent the rocket motor's exhaust from impinging on flammable materials.

90. What is the maximum launch angle from vertical for high power rocket?

30

20

There is no maximum launch angle.

The correct answer is 20. This means that there is a maximum launch angle of 20 degrees from the vertical for a high power rocket. This angle is likely determined by factors such as aerodynamics, stability, and safety considerations. Going beyond this angle may result in instability or other issues during the rocket's flight.

Explanation

The correct answer is 20. This means that there is a maximum launch angle of 20 degrees from the vertical for a high power rocket. This angle is likely determined by factors such as aerodynamics, stability, and safety considerations. Going beyond this angle may result in instability or other issues during the rocket's flight.

91. When shall firing circuits be armed?

When testing ignitor continuity

When the rocket is in the launching position

Both a and b

The firing circuits should be armed when the rocket is in the launching position because this ensures that all necessary safety measures have been taken and the rocket is ready for ignition. Arming the circuits at this stage prevents any accidental firing or premature ignition, which could be dangerous. Additionally, testing ignitor continuity is a crucial step to ensure that the rocket's ignition system is functioning properly before launch. Therefore, both options A and B are correct.

Explanation

The firing circuits should be armed when the rocket is in the launching position because this ensures that all necessary safety measures have been taken and the rocket is ready for ignition. Arming the circuits at this stage prevents any accidental firing or premature ignition, which could be dangerous. Additionally, testing ignitor continuity is a crucial step to ensure that the rocket's ignition system is functioning properly before launch. Therefore, both options A and B are correct.

92. What quantity of high power rocket motors, motor reloading kits and pyrotechnic modules may be stored in an indoor magazine?

25 pounds

50 pounds

There is no limit

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Explanation

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93. What is the key prerequisite for certification of a solid propellant high power rocket motor?

Prior classification by the U.S. Department of Transportation as a UN Division 1.3 or 1.4 eplosive or written acknowledgement of the motor or reload kit as a flammable solid

Authorization for manufacture of solid propellant high power rocket motors form the Authority Having Jurisdiction

Registration of the propellant formula and characteristics with the Bureau of Alcohol, Tobacco, Firearms and Explosives

The key prerequisite for certification of a solid propellant high power rocket motor is either prior classification by the U.S. Department of Transportation as a UN Division 1.3 or 1.4 explosive or written acknowledgement of the motor or reload kit as a flammable solid. This means that the rocket motor must be classified as either an explosive or a flammable solid by the appropriate authorities before it can be certified.

Explanation

The key prerequisite for certification of a solid propellant high power rocket motor is either prior classification by the U.S. Department of Transportation as a UN Division 1.3 or 1.4 explosive or written acknowledgement of the motor or reload kit as a flammable solid. This means that the rocket motor must be classified as either an explosive or a flammable solid by the appropriate authorities before it can be certified.

94. What is the age limit Tripoli recognizes for certified solid propellant high power rocket motor user?

21 years of age

18 years of age

There is no age limit

Tripoli recognizes 18 years of age as the age limit for certified solid propellant high power rocket motor users. This means that individuals must be at least 18 years old to be eligible to use these rocket motors. There is no specific age limit mentioned for individuals above 18 years of age, indicating that as long as they meet the minimum age requirement, they can use the rocket motors.

Explanation

Tripoli recognizes 18 years of age as the age limit for certified solid propellant high power rocket motor users. This means that individuals must be at least 18 years old to be eligible to use these rocket motors. There is no specific age limit mentioned for individuals above 18 years of age, indicating that as long as they meet the minimum age requirement, they can use the rocket motors.

95. What happens when the injector orifice in an ideal hybrid rocket motor is made smaller (assuming the oxidizer weight stays the same)?

The total impulse decreases and the average thrust increases

The total impulse stays the same and the average thrust increases

The total impulse stays the same and the average thrust decreases

When the injector orifice in an ideal hybrid rocket motor is made smaller, the total impulse generated by the motor remains the same. However, the average thrust decreases. This is because a smaller injector orifice restricts the flow of oxidizer into the combustion chamber, reducing the amount of propellant available for combustion. As a result, the average thrust produced by the motor decreases.

Explanation

When the injector orifice in an ideal hybrid rocket motor is made smaller, the total impulse generated by the motor remains the same. However, the average thrust decreases. This is because a smaller injector orifice restricts the flow of oxidizer into the combustion chamber, reducing the amount of propellant available for combustion. As a result, the average thrust produced by the motor decreases.

96. What happens when the injector orifice in an ideal hybrid rocket motor is increase in diameter (assume the oxidizer weight stays the same)?

The total impulse decreases and the average thrust increases

The total impulse stays the same and the average thrust increases

The total impulse stays the same and the average thrust decreases

When the injector orifice in an ideal hybrid rocket motor is increased in diameter, the total impulse stays the same because the oxidizer weight remains constant. However, the average thrust increases because the larger orifice allows for a greater flow rate of oxidizer, resulting in a higher average thrust.

Explanation

When the injector orifice in an ideal hybrid rocket motor is increased in diameter, the total impulse stays the same because the oxidizer weight remains constant. However, the average thrust increases because the larger orifice allows for a greater flow rate of oxidizer, resulting in a higher average thrust.

97. Above what temperature does pressurized nitrous oxide change to a gas?

97 F

75 F

37 F

Pressurized nitrous oxide changes to a gas above 97°F.

Explanation

Pressurized nitrous oxide changes to a gas above 97°F.

98. In general terms, the specific impulse of a rocket motor is:

The total force of the a motor throughout its action time

The total impulse divided by unit weight of propellant

Inversely related to the diameter and length of the propellant grain

The specific impulse of a rocket motor is the total impulse divided by the unit weight of the propellant. This means that it measures the efficiency of the rocket motor in terms of how much thrust it can produce per unit of propellant. A higher specific impulse indicates a more efficient motor, as it can generate more thrust for a given amount of propellant.

Explanation

The specific impulse of a rocket motor is the total impulse divided by the unit weight of the propellant. This means that it measures the efficiency of the rocket motor in terms of how much thrust it can produce per unit of propellant. A higher specific impulse indicates a more efficient motor, as it can generate more thrust for a given amount of propellant.

99. What does the motor designation I220-8 mean?

The motor has between 320-640 N-s impulse, an average thrust of 220 Newtons, with 8 seconds between motor ignition and ejection

The motor has 220 N-s impulse, and average thrust of 220 Newtons, with 8 seconds between the motor burn-out and ejection

The motor has between 320-640 N-s of impulse, an average thrust of 220 Newtons, with 8 seconds between motor burn-out and ejection

The motor designation I220-8 indicates that the motor has an impulse between 320-640 N-s, which refers to the total amount of force exerted by the motor over time. The average thrust of the motor is 220 Newtons, which is the average force exerted by the motor during operation. There is an 8-second delay between the motor burn-out and ejection, indicating the time delay before the motor completely stops functioning and the ejection process begins.

Explanation

The motor designation I220-8 indicates that the motor has an impulse between 320-640 N-s, which refers to the total amount of force exerted by the motor over time. The average thrust of the motor is 220 Newtons, which is the average force exerted by the motor during operation. There is an 8-second delay between the motor burn-out and ejection, indicating the time delay before the motor completely stops functioning and the ejection process begins.

100. A small hole is typically drilled near the top of a high power rockets airframe, below the nose cone or payload section. Why?

This hole vents excessive ejection charge pressure, reducing shock cord stress

The hole permits on-board altimeter to obtain air pressure readings

The hole vents internal air pressure as the rocket gains altitude to prevent premature separation

The correct answer is that the hole vents internal air pressure as the rocket gains altitude to prevent premature separation. As the rocket ascends, the air pressure inside the airframe increases. If this pressure is not released, it can cause the rocket to prematurely separate or even explode. By drilling a small hole near the top of the airframe, the excess air pressure can escape, ensuring that the rocket remains intact and stable during flight.

Explanation

The correct answer is that the hole vents internal air pressure as the rocket gains altitude to prevent premature separation. As the rocket ascends, the air pressure inside the airframe increases. If this pressure is not released, it can cause the rocket to prematurely separate or even explode. By drilling a small hole near the top of the airframe, the excess air pressure can escape, ensuring that the rocket remains intact and stable during flight.

101. When using an accelerometer-based altimeter in a rocket that may exceed Mach 1:

A “Mach delay” must be built into the altimeter to avoid deployment of the recovery system at Mach

One or more access holes must be drilled in the electronics bay to permit access to the atmosphere during flight

Neither a nor b need be done

When using an accelerometer-based altimeter in a rocket that may exceed Mach 1, neither a "Mach delay" nor drilling access holes in the electronics bay is necessary. This is because an accelerometer-based altimeter measures altitude based on changes in acceleration, rather than relying on atmospheric pressure or other external factors. Therefore, it can accurately measure altitude even at high speeds and does not require any additional adjustments or modifications.

Explanation

When using an accelerometer-based altimeter in a rocket that may exceed Mach 1, neither a "Mach delay" nor drilling access holes in the electronics bay is necessary. This is because an accelerometer-based altimeter measures altitude based on changes in acceleration, rather than relying on atmospheric pressure or other external factors. Therefore, it can accurately measure altitude even at high speeds and does not require any additional adjustments or modifications.

102. When using a pressure-based altimeter in a rocket that may exceed Mach 1:

A "Mach-delay" must be built into the altimeter to avoid deployment of the recovery system at Mach.

One or more access holes must be drilled in the electronics bay to permit access to the atmosphere during flight

Neither a nor b need be done

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Explanation

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103. According to the NFPA 1127, who is permitted to produce for sale a solid propellant high power rocket motor?

A commercial manufacturer

Anyone with the knowledge

Holders of a BATF Explosives Manufacturer license

According to the NFPA 1127, a commercial manufacturer is permitted to produce for sale a solid propellant high power rocket motor. This means that only companies or businesses that specialize in manufacturing rocket motors are allowed to produce and sell them commercially. This ensures that the production and sale of these potentially dangerous items are regulated and controlled by experts in the field.

Explanation

According to the NFPA 1127, a commercial manufacturer is permitted to produce for sale a solid propellant high power rocket motor. This means that only companies or businesses that specialize in manufacturing rocket motors are allowed to produce and sell them commercially. This ensures that the production and sale of these potentially dangerous items are regulated and controlled by experts in the field.

104. When must the manufacturer report changes to the authority that originally certified the certified high power rocket motor?

If the design results in greater than 20% deviation from the performance established at certification

Within 30 days of the change

No reports must be made

The manufacturer must report changes to the authority that originally certified the certified high power rocket motor within 30 days of the change. This is necessary if the design results in a greater than 20% deviation from the performance established at certification. No reports must be made if the change does not meet this criteria.

Explanation

The manufacturer must report changes to the authority that originally certified the certified high power rocket motor within 30 days of the change. This is necessary if the design results in a greater than 20% deviation from the performance established at certification. No reports must be made if the change does not meet this criteria.

105. When is electronically actuated recovery necessary?

There is no requirement, it is up to the flier

A high powered rocket launched with an installed impulse greater than 2560 N-sec

A high powered rocket launched with an installed impulse greater than 5120 N-sec

Electronically actuated recovery is necessary when a high powered rocket is launched with an installed impulse greater than 2560 N-sec. This indicates that the rocket has a significant amount of power and requires a more advanced recovery system that can be controlled electronically. This ensures a safe and controlled descent of the rocket after launch.

Explanation

Electronically actuated recovery is necessary when a high powered rocket is launched with an installed impulse greater than 2560 N-sec. This indicates that the rocket has a significant amount of power and requires a more advanced recovery system that can be controlled electronically. This ensures a safe and controlled descent of the rocket after launch.

106. What is the alternate launch site criterion?

No less than 1500 feet

No less than one-half the maximum altitude expected or granted by the FAA

Both a and b

The alternate launch site criterion refers to the minimum requirements for a launch site. According to the given options, the criterion includes both a minimum altitude of 1500 feet and a minimum altitude of one-half the maximum altitude expected or granted by the FAA. Therefore, the correct answer is "Both a and b".

Explanation

The alternate launch site criterion refers to the minimum requirements for a launch site. According to the given options, the criterion includes both a minimum altitude of 1500 feet and a minimum altitude of one-half the maximum altitude expected or granted by the FAA. Therefore, the correct answer is "Both a and b".

107. How close can spectators be to a high power launch?

At the distance defined by, and behind, the Safety Monitor

At the distance show in the Safe Distances Table

Both a and b

The correct answer is "At the distance defined by, and behind, the Safety Monitor." This means that spectators should be positioned at a distance that is determined and specified by the Safety Monitor. They should also be positioned behind the Safety Monitor to ensure their safety during a high power launch. This answer indicates that both the distance specified by the Safety Monitor and being behind the Safety Monitor are important factors in determining how close spectators can be to a high power launch.

Explanation

The correct answer is "At the distance defined by, and behind, the Safety Monitor." This means that spectators should be positioned at a distance that is determined and specified by the Safety Monitor. They should also be positioned behind the Safety Monitor to ensure their safety during a high power launch. This answer indicates that both the distance specified by the Safety Monitor and being behind the Safety Monitor are important factors in determining how close spectators can be to a high power launch.

108. When is conveying a high power rocket motor to an uncertified person permitted?

When the motors are not to be transported outside the state of manufacture

When the sale of motors are limited to certified users

It is never permitted

Conveying a high power rocket motor to an uncertified person is only permitted when the motors are not intended to be transported outside the state of manufacture. This means that as long as the motors stay within the state where they were produced, uncertified individuals can handle them. However, if there is any intention of transporting the motors across state lines, then conveying them to an uncertified person is not allowed.

Explanation

Conveying a high power rocket motor to an uncertified person is only permitted when the motors are not intended to be transported outside the state of manufacture. This means that as long as the motors stay within the state where they were produced, uncertified individuals can handle them. However, if there is any intention of transporting the motors across state lines, then conveying them to an uncertified person is not allowed.