Discussion
The term \( Z_\alpha/u_0 \) in the short-period damping expression represents
Answer: C
An incidence increase raises lift, which curves the flight path upwards; the climbing flight path then reduces the very incidence that produced it. That heave, or plunge, damping is what \( Z_\alpha/u_0 \) measures, and it is the reason a high lift curve slope helps short-period damping. Drag with incidence is a much smaller effect and belongs mainly to the phugoid. Elevator lift is a control term rather than a stability derivative in this expression. Fuselage moments in sideslip are a lateral-directional matter and cannot appear in the longitudinal equations.
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