HPR Level 2 Technical Questions
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#1. The definition of coefficient of drag (Cd) is:
#2. How do you convert Newtons of thrust to pounds of thrust?
#3. For a cluster rocket, which construction technique will minimize the effect of one motor failing to ignite?
#4. For an inherently stable rocket, which statement about the center of gravity (CG) and the center of pressure (CP) is true?
#5. What is the most common oxidizer in commercially available high power composite solid rocket motors?
#6. When using a pressure-sensor altimeter in a rocket that will not reach Mach 1:
#7. What is the “rule-of-thumb” for a stable rocket?
#9. What is the oxidizer most commonly used in a commercial hybrid rocket motor?
#10. What are the three major factors that determine the maximum altitude of a high-power rocket in vertical flight?
#11. Which of the motors listed below has the highest average thrust?
#12. What typically happens to a marginally stable rocket with a hybrid motor during the thrusting phase?
#13. Which of the following is most likely in dual-deployment rockets that use a drogue and a main parachute?
#14. Most APCP (ammonium perchlorate composite propellant) rocket motors are central- burning rather than end-burning:
#15. A rocket with a motor cluster consisting of a central composite motor and four black powder motors, using five identical igniters:
#16. What does the motor designation I220-8 mean?
#17. A Bates grain has an essentially neutral thrust curve because:
#18. What is the difference between a J640 and a J320 high power rocket motor (assume full 1280 Newton-second J motors)?
#19. In general terms, the specific impulse of a rocket motor is:
#20. When using an accelerometer-based altimeter in a rocket that may exceed Mach 1:
#21. How can a statically unstable rocket be made stable?
#22. The center of pressure (CP) of a rocket is generally defined as:
#23. What ordinarily happens to the center of gravity (CG) of a rocket during a solid rocket motor’s thrusting phase?
#24. What effect does a boat tail have on a subsonic rocket’s coefficient of drag (C d)?
#25. Rocket A is descending at 10 feet per second, rocket B weighs the same but is descending at 20 feet per second. Which statement is true?
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