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More up elevator is required to trim as speed falls because

  • A.The wing's aerodynamic centre moves forward
  • B.A higher angle of attack must be balanced
  • C.The elevator becomes less effective at low speed only
  • D.The centre of gravity moves aft

Answer: B

Trimming at a lower speed means flying at a higher lift coefficient, which changes the balance of moments about the centre of gravity. The gradient of that requirement with speed is the flight test measure of stick fixed static stability.

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