Discussion
The hinge moment derivative with incidence governs
Answer: D
\( C_{h_\alpha} \) governs floating: with the controls released, the surface takes up whatever angle drives the hinge moment to zero, and that angle depends on the ratio of the two hinge derivatives. It is the mechanism behind stick-free stability being different from stick-fixed. The stick force at zero deflection is a trim and tab matter. Pitch damping is a whole-aeroplane derivative. Actuator travel is a mechanical limit.
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