Discussion
Which symbol denotes the pitching moment derivative with incidence?
Answer: B
The pitching moment derivative with incidence is written \( C_{m_\alpha} \), read as the derivative of the pitching moment coefficient with respect to angle of attack, and it is the static longitudinal stability derivative. \( C_{L_\alpha} \) is the lift curve slope, a force derivative on the same independent variable. \( C_{n_\beta} \) is the yawing moment with sideslip, the directional stiffness. \( C_{l_p} \) is roll damping. The convention is consistent throughout: the main subscript names the coefficient, the second names the variable differentiated against.
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