Discussion
Why is Dutch roll damping specified as a damping ratio and also as a product with frequency?
Answer: A
The two constraints catch different faults: the ratio governs the shape of the decay while the product governs its speed in seconds, so a low-frequency mode can satisfy the ratio and still wallow for twenty seconds. Specifying both closes that gap. Both come from one trace and one set of instruments. The ratio is perfectly measurable by logarithmic decrement. And the product does not determine the frequency; it is a product of it.
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