Discussion
A Dutch roll damps to half amplitude in 3 cycles while a well damped mode takes 1. The poorly damped case takes
Answer: B
Correct answer: Three times as many cycles
The comparison is a ratio of cycles to half amplitude:
\[ \frac{3}{1} = 3 \]
Cycles to half amplitude is the standard measure of oscillatory damping, and fewer is better. A Dutch roll taking three cycles to halve is poorly damped and tiring to fly, since the oscillation persists visibly after every disturbance. The usual causes are excessive dihedral effect relative to directional stability, and the usual remedy is a yaw damper rather than a change to the airframe.
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