HPR Level 2—Section B: Rocket Motor Designations

B1) What does the “H” in the motor designation H100-5 stand for?
A) It is the first letter in the manufacturer’s name
B) It indicates the total power range or impulse range of the rocket motor
C) It indicates the total thrust of the rocket motor
D) It indicates that the motor uses black powder as a propellant
B2) What does the “100” in the motor designation H100-5 stand for?
A) It is the peak thrust in pounds of the rocket motor
B) It is the rocket motor burn time in seconds
C) It is the average thrust in Newtons of the rocket motor
D) It is the manufacturer’s retail price code
B3) What does the “5” in the motor designation H100-5 stand for?
A) It is the rocket motor burn time
B) It is the peak thrust (in kilograms) of the rocket motor
C) It is the average thrust of the rocket motor
D) It is the ejection charge delay time
B4) What are the units of measurement for the “100” in the motor designation H100-5?
A) Newtons per second
B) Newtons
C) Newton-seconds
D) Feet per second
B5) What is the maximum allowable impulse for a “J” rocket motor?
A) 320.00 Newton-seconds
B) 640.00 Newton-seconds
C) 1280.00 Newton-seconds
D) 2560.00 Newton-seconds
B6) Assuming that each motor has the full allowable impulse, how many “H” motors have the same total impulse as a single “J” motor?
A) 3 motors
B) 1 motor
C) 2 motors
D) 4 motors
B7) You have an H64-8 rocket motor which has been certified to have a total impulse of 320.00 Newton-seconds. What is the approximate burn time for this motor?
A) 3 seconds
B) 5 seconds
C) 8 seconds
D) 10 seconds
B8) The manufacturer’s test data shows a total impulse of 690 Newton-seconds for your motor. What impulse class does your motor represent?
A) “H”
B) “I”
C) “J”
D) “K”
B9) The manufacturer’s test data shows an average thrust of 100 Newtons for 6 seconds for your motor. What impulse class does your motor represent?
A) “H”
B) “I”
C) “J”
D) “K”
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