underswing

underswing

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The difference between RPM for the transient droop and the static droop of a helicopter rotor.
An Illustrated Dictionary of Aviation Copyright © 2005 by The McGraw-Hill Companies, Inc. All rights reserved
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In the beginning, you'll probably overswing the far targets and underswing the close ones, but once you're used to them, the longer tubes will smooth out your swing and become a great asset.