Discussion
Why does a yaw damper include a washout, or high-pass, filter?
Answer: A
A steady turn has a steady yaw rate, and an unfiltered damper would read that as a disturbance and hold rudder against the turn. The washout passes the oscillatory Dutch roll frequencies and blocks the steady component, so the damper works in the turn without fighting it. Increasing low-frequency gain is the opposite of what a washout does. Blocking the Dutch roll would defeat the whole purpose. Adverse yaw is handled by aileron design and by rudder coordination, not by this filter.
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