Discussion
Which symbol denotes the hinge moment derivative with deflection?
Answer: D
It is \( C_{h_\delta} \), the derivative of the hinge moment coefficient with respect to the surface's own deflection, and it sets the self-centring of the control. \( C_{h_\alpha} \) is the derivative with incidence, which drives floating. \( C_{m_{\delta e}} \) is the aeroplane's pitching moment per unit elevator, the control effectiveness. \( C_{l_{\delta a}} \) is aileron rolling effectiveness. Two of these are hinge quantities and two are whole-aeroplane ones, and the distinction is the crux of the topic.
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