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The free-elevator factor in the stick-free tail contribution depends on

  • A.The mass of the elevator and its balance weight
  • B.The stick gearing between the column and the surface, which scales what the pilot feels
  • C.The ratio of the two hinge moment derivatives and the elevator effectiveness
  • D.The elevator area alone

Answer: C

The factor is built from \( \tau C_{h_\alpha}/C_{h_\delta} \), so it combines the float tendency with how much moment a degree of elevator produces. Area enters through those derivatives rather than on its own. Elevator mass and its balance weight matter for flutter and for inertia effects in manoeuvres, not for the steady float. Stick gearing scales the force the pilot feels but cannot change where the surface floats to, since floating happens with the stick free.

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