Discussion
Match each derivative with the surface that supplies most of it.
List I
A. Pitching moment with pitch rate
B. Yawing moment with sideslip
C. Rolling moment with roll rate
List II
P. The wing
Q. The horizontal tail
R. The vertical tail
Select the correct match.
Answer: A
Pitch damping comes from the horizontal tail on its arm, directional stiffness from the fin, and roll damping from the wing across its span, so A-Q, B-R, C-P. Each pairing follows from where the relevant velocity change is largest: a pitch rate moves the tail vertically, a sideslip strikes the fin, and a roll rate changes incidence most at the wing tips. Getting these attributions right is what lets a designer predict which derivative a geometry change will move.
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