Discussion
Which of these is NOT a stability derivative?
Answer: C
The hinge moment derivative is a control-system quantity, describing the load on the elevator itself, and it governs stick force rather than the aeroplane's motion; it appears in stick-free stability and in artificial feel design. The other three differentiate a whole-aeroplane moment with respect to a motion variable and are stability derivatives in the strict sense. Hinge moments matter enormously to how an aeroplane feels, which is why they are studied under a heading of their own.
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