Discussion
Which mode is normally the hardest to give adequate damping without augmentation?
Answer: A
The Dutch roll is the awkward one: its damping comes mainly from the yaw damping derivative, which falls with altitude, and the dihedral effect that helps the spiral works against it. That is why a yaw damper is standard equipment on swept-wing transports rather than an option. The roll subsidence is always well damped by the wing itself. The spiral needs no damping in the same sense, being aperiodic and slow enough to correct. The short period is longitudinal and is dealt with by a pitch damper.
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