Discussion
An estimate that a derivative is proportional to tail volume coefficient refers to the product of
Answer: D
Tail volume coefficient is \( S_t l_t / S\bar c \) for the horizontal surface, and \( S_v l_v / S b \) for the vertical, a dimensionless measure of how much moment-generating capability the tail has relative to the wing. It is the single most useful number in tail sizing, since pitch stiffness and directional stiffness both scale with it. Thickness affects drag rather than moment capability, and dynamic pressure is not part of a geometric coefficient.
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