HPR Level 2 Technical Questions
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#1. For a cluster rocket, which construction technique will minimize the effect of one motor failing to ignite?
#2. How can a statically unstable rocket be made stable?
#3. How does Newton’s Third Law “To every action there is always an equal and opposite reaction” relate to rocketry?
#6. How do you convert Newtons of thrust to pounds of thrust?
#7. Most APCP (ammonium perchlorate composite propellant) rocket motors are central- burning rather than end-burning:
#8. For a subsonic rocket, what factors most greatly affect the coefficient of drag (C d)?
#9. What is the oxidizer most commonly used in a commercial hybrid rocket motor?
#11. What is the difference between a J640 and a J320 high power rocket motor (assume full 1280 Newton-second J motors)?
#12. The flight of a high-power rocket can be separated into three portions; they are:
#13. Which of the following is most likely in dual-deployment rockets that use a drogue and a main parachute?
#14. Which describes the thrust curve of a progressive motor?
#15. Rocket A weighs twice as much as rocket B. Both are descending at 20 feet per second. Which statement is true?
#16. What are three methods used to shift the center of gravity (CG) of a rocket forward?
#17. Which of the motors listed below has the highest total impulse?
#18. What can happen if all the motors of a cluster do not ignite at launch?
#19. For an inherently stable rocket, which statement about the center of gravity (CG) and the center of pressure (CP) is true?
#20. What happens to the coefficient of drag (Cd) as the rocket approaches the speed of sound?
#21. Which of Newton’s Laws best describes the behavior of a rocket motor?
#22. What is the major issue with accelerometer-based altimeters?
#23. 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?
#24. A small hole is typically drilled near the top of a high-power rocket’s airframe, below the nosecone or payload section. Why?
#25. What are the three major factors that determine the maximum altitude of a high-power rocket in vertical flight?
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