Discussion
The heave subsidence that appears in the short-period approximation when pitch stiffness is very small is best described as
Answer: D
With little or no stiffness in incidence, the mode becomes a simple aperiodic decay: the aeroplane's lift and pitch damping bleed away an incidence disturbance without any tendency to overshoot, at a rate set essentially by \( Z_\alpha/u_0 \) together with \( M_q \). It is not an oscillation, so describing it as rapid pitching is wrong on the face of it. It is not a speed divergence, which is what tuck produces through a different mechanism. And it is firmly longitudinal, arising from the same two equations as the short period it replaces.
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