Discussion
The damping of the phugoid depends most directly on which of the following?
Answer: B
Phugoid damping comes from the speed derivatives, and drag is the dominant one: the estimate \( \zeta_{ph} \approx C_D/(\sqrt{2}\,C_L) \) contains nothing else. Physically, drag is the only thing removing energy from a motion that is otherwise a clean exchange of height for speed. Pitching moment due to pitch rate damps the short period, where there is real angular velocity to oppose; in the phugoid the aeroplane rotates so slowly that the term does almost nothing. Elevator power and tailplane volume set trim and static stability, and they influence the short period, not this mode's decay.
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