---------------------------------------------------------- Glasair-List Digest Archive --- Total Messages Posted Mon 09/06/04: 1 ---------------------------------------------------------- Today's Message Index: ---------------------- 1. 08:40 PM - Re: Glasair-List Digest: 2 Msgs - 09/05/04 (Land Shorter) ________________________________ Message 1 _____________________________________ Time: 08:40:43 PM PST US From: Land Shorter Subject: Glasair-List: Re: Glasair-List Digest: 2 Msgs - 09/05/04 --> Glasair-List message posted by: Land Shorter 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 +++++++++++++++++++++++++++++++++++++++++++++++ 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 ---------------------------------