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1. 08:40 PM - Re: Glasair-List Digest: 2 Msgs - 09/05/04 (Land Shorter)
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| Subject: | Re: Glasair-List Digest: 2 Msgs - 09/05/04 |
--> Glasair-List message posted by: Land Shorter <landshorter2@yahoo.com>
VG's have been used on laminar flow wings (and "semi" laminar flow wings). I've
heard some people report no change in cruise (Lancairs) and others report about
a 1-2% loss in cruise when used on laminar wings.
They definitely help the bottom end though and many pilots find this to compensate
for any loss in cruise (if any).
Also keep in mind that they can be used to help tail effectiveness as well as to
reduce drag by controlling localized flow. Check out the local flow articles
at...
http://www.cafefoundation.org/research.htm
Thanks folks!
Joa
www.landshorter.com
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I don't recall ever seeing VG on a high wing load designed airplane. JUst
thinking through the concept on a Glasair wing....the airsteam stays
attached until pretty far back while in cruise and becomes unattached fairly
quickly from a point much farther forward at stall. Is it possible for VG
to decrease stall speed (at 10% of chord) without increasing drag at cruise
speed?
I am not so much trying to critique the concept as to find out if anybody
has had an increase in speed on an already fast wing. Robin Young
286YM....Glasair TD
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