Discussion
Derivatives are evaluated about the trim condition because
Answer: B
Linearisation is the whole basis of the method: the aerodynamic forces are expanded as a Taylor series about trim and truncated after the first-order terms, whose coefficients are the derivatives. That is why a set of derivatives is quoted for a stated speed, altitude and configuration, and why a different flight condition needs a different set. Tunnel capability has nothing to do with it. Aeroplanes leave trim constantly, which is precisely why the perturbation equations are needed. The units follow from the definition rather than from the choice of reference.
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