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Old 13th Jul 2017, 15:11   #3 (permalink)
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Join Date: Apr 2000
Location: EGDC
Posts: 6,171
As a rough rule of thumb, if you know what the rate of descent is at best speed in autorotation, it is a pretty good indicator of the downwash speed in the OGE hover. Not exact or mathematical but pretty good as a ballpark figure.

For example 2000'/min equates to just under 20 kts.
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