Discussion
Where does the float angle of a released elevator come from?
Answer: B
The surface floats to the angle where its total hinge moment is zero, which is set by the ratio of the incidence derivative to the deflection derivative. Static margin is a whole-aeroplane property that the float angle affects rather than the reverse. Gearing scales the force the pilot feels and cannot influence where a released surface settles. Mass matters in a manoeuvre and for flutter, but the steady float is purely aerodynamic.
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