From: "Gary Casey" <glcasey@adelphia.net>
To: <lancair.list@olsusa.com>
Subject: windmilling props
Date: Sun, 7 Apr 2002 06:59:21 -0700
Message-ID: <NEBBIBKBKLGPNKKOGMMBCEPDEFAB.glcasey@adelphia.net>
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>>
<<I think it is explainable when you look at the prop from the front or rear
and
then look at the speed brakes being sold.  The flat plate area of the prop
far
exceeds the area of any speed break that I have seen.  Then additionally it
probably boils down to, can the air negotiate the turn to smoothly flow
around the
stopped prop.>>

True, but a windmilling prop, while the drag of the blade itself might be
less, has to generate enough power to spin the engine, which has to come
from the air.  I always wondered which was less drag and now it looks like
we have some real data to go by - it says pull the prop control back, but
don't waste time and altitude trying to get the prop to stop spinning.  Best
to spend your time figuring out where to land as the spinning prop probably
has less drag anyway.

Gary Casey
ES project


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