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Stick fixed stability refers to the aeroplane's behaviour when

  • A.The elevator is held at a constant angle
  • B.The elevator is free to float
  • C.The trim tab is neutral
  • D.The autopilot is engaged

Answer: A

Holding the surface makes the elevator angle a controlled variable rather than something the aerodynamics determine. It is the simpler of the two cases and the one usually analysed first, since the tail's full lift curve slope is then available.

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