Discussion
Match each lateral derivative with the mode quantity it most directly fixes.
List I
A. Yawing moment with sideslip
B. Rolling moment with roll rate
C. Rolling moment with sideslip
List II
P. Roll mode time constant
Q. Dutch roll frequency
R. Roll content of the Dutch roll
Select the correct match.
Answer: C
Directional stiffness fixes the frequency, roll damping fixes the roll time constant, and the dihedral effect fixes how much rolling accompanies the sideslip, so A-Q, B-P, C-R. The third pairing is the one that decides whether a Dutch roll is felt as a wing rock or a nose wag, and it is also the derivative that trades against spiral stability. The alternatives all attach a stiffness derivative to a damping quantity or the reverse.
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