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#1. Which of Newton’s Laws best describes the behavior of a rocket motor?
#2. How does Newton’s Third Law “To every action there is always an equal and opposite reaction” relate to rocketry?
#3. What are the three forces acting upon a rocket during flight?
#4. What are the three major factors that determine the maximum altitude of a high-power rocket in vertical flight?
#5. For an inherently stable rocket, which statement about the center of gravity (CG) and the center of pressure (CP) is true?
#6. 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 a rocket likely to be stable?
#7. The center of pressure (CP) of a rocket is generally defined as:
#8. What is the “rule-of-thumb” for a stable rocket?
#9. 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?
#10. What ordinarily happens to the center of gravity (CG) of a rocket during a solid rocket motor’s thrusting phase?
#11. How can a statically unstable rocket be made stable?
#12. What are three methods used to shift the center of gravity (CG) of a rocket forward?
#13. What are three methods used to shift the center of pressure (CP) aft?
#14. The definition of coefficient of drag (Cd) is:
#15. What happens to the coefficient of drag (Cd) as the rocket approaches the speed of sound?
#16. For a subsonic rocket, what factors most greatly affect the coefficient of drag (C d)?
#17. What effect does a boat tail have on a subsonic rocket’s coefficient of drag (C d)?
#18. The flight of a high-power rocket can be separated into three portions; they are:
#19. Which describes the thrust curve of a regressive motor burn?
#20. Which describes the thrust curve of a progressive motor?
#21. A Bates grain has an essentially neutral thrust curve because:
#22. What is the most common function of a motor liner and the O-ring seals in a solid rocket motor?
#23. What is the most common oxidizer in commercially available high power composite solid rocket motors?
#25. A small hole is typically drilled near the top of a high-power rocket’s airframe, below the nosecone or payload section. Why?
#26. How do you convert Newtons of thrust to pounds of thrust?
#28. What is the oxidizer most commonly used in a commercial hybrid rocket motor?
#29. For a rocket with a much less than 10:1 “length to diameter” (L/D) ratio, such as spools and pyramids, what type of drag contributes significantly to stability and makes it possible to fly without much, if any, nose weight?
#30. When doing an air-start of an L class motor, which of the following would be considered the safest configuration?
#31. A rocket with a motor cluster consisting of a central composite motor and four black powder motors, using five identical igniters:
#32. What typically happens to a marginally stable rocket with a hybrid motor during the thrusting phase?
#33. In general terms, the specific impulse of a rocket motor is:
#34. In general terms, the total impulse of a rocket motor can be described as:
#35. The average thrust of a rocket motor is 100 Newtons, and the burn time is 4 seconds. What is the total impulse?
#36. Which of the motors listed below has the highest total impulse?
#37. Which of the motors listed below has the highest average thrust?
#38. What is the difference between a J640 and a J320 high power rocket motor (assume full 1280 Newton-second J motors)?
#39. Which of the following has a total impulse (It) in the J motor range?
#41. What does the motor designation I220-8 mean?
#42. 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?
#43. Rocket A weighs twice as much as rocket B. Both are descending at 20 feet per second. Which statement is true?
#44. What is the purpose of a launch rod, rail or tower?
#45. What is the purpose of a launch lug or rail buttons?
#46. For a cluster rocket, which construction technique will minimize the effect of one motor failing to ignite?
#47. What can happen if all the motors of a cluster do not ignite at launch?
#50. What is the primary requirement for a rocket motor ignitor?
#51. Most APCP (ammonium perchlorate composite propellant) rocket motors are central- burning rather than end-burning:
#52. Which of the following is most likely in dual-deployment rockets that use a drogue and a main parachute?
#53. When using an accelerometer-based altimeter in a rocket that may exceed Mach 1:
#54. When using a pressure-sensor altimeter in a rocket that will not reach Mach 1:
#55. What is the major issue with accelerometer-based altimeters?
New Jolly Logic Altimeters and Chute Release
SUNDAY Launch – 27th November – Whalan