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Level 2d

Quiz by William Hanson

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8 questions
Show answers
  • Q1
    D1) For a rocket to be stable which of the following statements is true?
    A) The center of pressure (CP) must be behind the center of gravity (CG)
    B) The center of pressure (CP) must be in front of the center of gravity (CG)
    C) The rocket must have fins
    D) The length of the body tube must be at least 5 times the model diameter
    30s
  • Q2
    D2) An unstable rocket can be made stable by:
    A) Adding sufficient weight to the nosecone
    C) Moving the fins sufficiently forward towards the nosecone
    D) Making the rocket sufficiently shorter
    B) Removing sufficient weight from the nosecone
    30s
  • Q3
    D3) Rocket stability can be estimated by:
    D) Stability cannot be estimated before a test flight.
    B) “Cardboard cutout“ method
    C) Determining the relative positions of the center of pressure and center of gravity
    A) Center of pressure “Barrowman“ equations
    30s
  • Q4
    D4) A rocket’s center of pressure can be estimated by:
    A) The “Barrowman“ method
    B) Finding the point where the model balances
    C) “Cardboard cutout“ method
    D) Both “A“ and “C“ above (Barrowman or Cardboard cutout)
    30s
  • Q5
    D5) An unstable rocket can usually be made more stable by:
    D) Increasing the rocket diameter
    B) Increasing the size of the aft fins
    C) Using a larger, heavier rocket motor
    A) Using a shorter nosecone
    30s
  • Q6
    D6) During boost a rocket powered by a solid rocket motor tends to become:
    A) Less stable in flight
    B) More stable in flight
    C) No change in stability
    D) Unstable
    30s
  • Q7
    D7) Which of the following can cause unstable flight?
    B) Misaligned motor mount tube or motor nozzle
    A) Weak tubes or couplers that permit airframe bending
    D) All of the above (airframe bending, misaligned motor, inadequate speed off rail)
    C) Inadequate airspeed leaving the launch tower on a breezy day
    30s
  • Q8
    D8) As a rule of thumb, how far should the center of pressure be from the center of gravity?
    C) The center of pressure should be at least 1.0 body tube diameters ahead of the center of gravity
    B) The center of pressure should be at least 1.0 body tube diameters behind the center of gravity
    A) The center of pressure should be at the same location as the center of gravity
    D) The center of pressure should be 1.0 body tube diameters ahead of the fin leading edge; the center of gravity does not matter
    30s

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