Discussion
Statement I: The tail contribution to pitch damping grows roughly with the square of the tail arm.
Statement II: A pitch rate changes the tail's local incidence in proportion to the arm, and that force then acts through the same arm.
In the light of the above statements, choose the correct answer.
Answer: A
Both statements are correct, and the second is the derivation of the first. The incidence increment is \( q\,l_t/V \), so the tail force is proportional to the arm, and the moment is that force times the arm again - hence the square. It is why stretching a fuselage improves pitch damping so effectively, and why a tailless configuration struggles for it. The same argument, with the span in place of the arm, explains why roll damping scales with the square of the span.
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