Naaaa. Propellers in disturbed flow can excite the system, but
usually the concern is the opposite. Might be a few rare causes. For
example, I've seen (with telemetry) a variation in torsional vibration
due to a propeller-powerplant whirl mode.


Hi Dan,
Can you say a little more about the example of the whirl mode you saw?

Kent Felkins
Tulsa


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