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Old 16th Nov 2004, 02:05
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mono
 
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qwertyuiop

Most modern jets use IRU's which incorporate 3 RATE gyro's. Yaw rate being fed from these.

Several Yaw dampers on older a/c had a built in rate gyro, others used derived rate fed from a basic DG.

However damping of dutch roll (can we still say that in these overly PC times??) is, and will always be, a rate function. It is what is known as a rate/rate system i.e. system response is a product of the RATE of displacement rather than size of the displacement.
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