Discussion
The hinge moment derivative with surface deflection is normally
Answer: C
\( C_{h_\delta} \) is negative: deflecting the surface produces a moment opposing the deflection, which is what gives the pilot a positive force gradient and makes the control feel like a spring. A positive value would mean overbalance, where the surface runs away from neutral and the stick force reverses - a genuinely dangerous condition. Zero would give a control with no self-centring at all. And the sign does not reverse with speed, though the magnitude grows with dynamic pressure.
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