Discussion
Match each lateral derivative with what it chiefly governs.
List I
A. Yawing moment with sideslip
B. Rolling moment with roll rate
C. Yawing moment with yaw rate
List II
P. Roll mode time constant
Q. Dutch roll frequency
R. Dutch roll damping
Select the correct match.
Answer: D
Directional stiffness sets the frequency, roll damping sets the roll time constant, and yaw damping sets the Dutch roll damping, so A-Q, B-P, C-R. Sorting the lateral derivatives this way is the fastest route through most questions on the topic, and it mirrors the longitudinal pattern in which one derivative supplies stiffness and another supplies damping. The alternatives all swap a stiffness for a damping term, which is the error the mapping exists to prevent.
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