Junior High Power Certification - National
Association of Rocketry - Jr HPR High
Power Rocketry ACTUAL QUESTIONS
AND CORRECT ANSWERS
Assuming that each motor delivers the full impulse associated with its letter class, which
motor has the shortest burn time? - CORRECT ANSWERS✅✅B) H200
If the shoulder of your rocket's nosecone is a loose fit in the body tube, what is the most
likely problem during the flight? - CORRECT ANSWERS✅✅A) The nose cone could drag
separate from the body tube possibly accompanied by a high-speed recovery system
deployment at motor burnout
The Center of Gravity (CG) or Mass of a rocket is the point at which: - CORRECT
ANSWERS✅✅C) There is an equal amount of mass forward and aft of this point
Your simulation program indicates that your rocket will achieve safe velocity, with the
planned motor, just as it leaves the top of a 10-foot launch rail. At the current launch, with
winds over 5 MPH, only 8-foot rails a - CORRECT ANSWERS✅✅B) Re-run your
simulation using an appropriate higher-thrust motor to achieve safe velocity with the 8-foot
rail
What are methods to increase the stability of a model rocket? - CORRECT
ANSWERS✅✅A) Increase fin size aft of the Center of Gravity, add nose weight
Your current certification rocket has flown several times, in calm winds, with an 8-second
delay deploying the parachute right at apogee. In launch conditions with winds at 15 knots,
which is the best choice? - CORRECT ANSWERS✅✅C) Use a shorter Delay
Which of the following is considered to be a complex rocket? - CORRECT
ANSWERS✅✅C) Both "A" and "B" (Clustered or Multistage)
, The following is a good rule-of-thumb to ensure a rocket's stability: - CORRECT
ANSWERS✅✅A) The Center of Gravity is located at least one body diameter forward of
the calculated Center of Pressure
The following will increase the stability of a model rocketry: - CORRECT
ANSWERS✅✅A) Adding Nose Weight
The rocket's Center of Pressure (CP) is defined as: - CORRECT ANSWERS✅✅B) The
single point where the average of all aerodynamic forces acts through the rocket
Your launch pads are located 1,200 feet from public highway 99. How much traffic flow, not
related to the launch, is allowed for safe launch operations? - CORRECT ANSWERS✅✅B)
No more than 10 vehicles per hour
You really want to launch your high power rocket, but the club's only battery for the
electrical launch system is dead. One of the spectators has some green fuse from his last
pyrotechnics show. It's OK to launch using t - CORRECT ANSWERS✅✅B) False
Is it permissable to launch a high power rocket: - CORRECT ANSWERS✅✅C) Neither A
or B (Not into clouds/Airplanes)
The flight from question C16 was a spectacular success, and now you want to fly the rocket
on three Aerotech G75M "sparky" motors. What is the required minimum diameter of cleared
area around the launch pad? - CORRECT ANSWERS✅✅B) 75 ft
You have built a cluster rocket that you plan to fly on three Aerotech single-use G80 motors,
total impulse each of 120 Newton-Seconds. What is the required minimum personnel
distance and minimum diameter of cleared area - CORRECT ANSWERS✅✅C) 200 feet, 50
feet
What is the maximum wind speed permitted when launching high-power rockets, in miles per
hour (MPH)? - CORRECT ANSWERS✅✅B) 20
Association of Rocketry - Jr HPR High
Power Rocketry ACTUAL QUESTIONS
AND CORRECT ANSWERS
Assuming that each motor delivers the full impulse associated with its letter class, which
motor has the shortest burn time? - CORRECT ANSWERS✅✅B) H200
If the shoulder of your rocket's nosecone is a loose fit in the body tube, what is the most
likely problem during the flight? - CORRECT ANSWERS✅✅A) The nose cone could drag
separate from the body tube possibly accompanied by a high-speed recovery system
deployment at motor burnout
The Center of Gravity (CG) or Mass of a rocket is the point at which: - CORRECT
ANSWERS✅✅C) There is an equal amount of mass forward and aft of this point
Your simulation program indicates that your rocket will achieve safe velocity, with the
planned motor, just as it leaves the top of a 10-foot launch rail. At the current launch, with
winds over 5 MPH, only 8-foot rails a - CORRECT ANSWERS✅✅B) Re-run your
simulation using an appropriate higher-thrust motor to achieve safe velocity with the 8-foot
rail
What are methods to increase the stability of a model rocket? - CORRECT
ANSWERS✅✅A) Increase fin size aft of the Center of Gravity, add nose weight
Your current certification rocket has flown several times, in calm winds, with an 8-second
delay deploying the parachute right at apogee. In launch conditions with winds at 15 knots,
which is the best choice? - CORRECT ANSWERS✅✅C) Use a shorter Delay
Which of the following is considered to be a complex rocket? - CORRECT
ANSWERS✅✅C) Both "A" and "B" (Clustered or Multistage)
, The following is a good rule-of-thumb to ensure a rocket's stability: - CORRECT
ANSWERS✅✅A) The Center of Gravity is located at least one body diameter forward of
the calculated Center of Pressure
The following will increase the stability of a model rocketry: - CORRECT
ANSWERS✅✅A) Adding Nose Weight
The rocket's Center of Pressure (CP) is defined as: - CORRECT ANSWERS✅✅B) The
single point where the average of all aerodynamic forces acts through the rocket
Your launch pads are located 1,200 feet from public highway 99. How much traffic flow, not
related to the launch, is allowed for safe launch operations? - CORRECT ANSWERS✅✅B)
No more than 10 vehicles per hour
You really want to launch your high power rocket, but the club's only battery for the
electrical launch system is dead. One of the spectators has some green fuse from his last
pyrotechnics show. It's OK to launch using t - CORRECT ANSWERS✅✅B) False
Is it permissable to launch a high power rocket: - CORRECT ANSWERS✅✅C) Neither A
or B (Not into clouds/Airplanes)
The flight from question C16 was a spectacular success, and now you want to fly the rocket
on three Aerotech G75M "sparky" motors. What is the required minimum diameter of cleared
area around the launch pad? - CORRECT ANSWERS✅✅B) 75 ft
You have built a cluster rocket that you plan to fly on three Aerotech single-use G80 motors,
total impulse each of 120 Newton-Seconds. What is the required minimum personnel
distance and minimum diameter of cleared area - CORRECT ANSWERS✅✅C) 200 feet, 50
feet
What is the maximum wind speed permitted when launching high-power rockets, in miles per
hour (MPH)? - CORRECT ANSWERS✅✅B) 20
