"Asymmetry is not required to generate lift. Try thinking of stunt planes that fly up-side-down. I don't know if they have asymmetrical foils, but they can fly wheels upward or downward because lift is a matter of angle of attack. " Then try thinking of why the stunt plane does have an asymmetric foil wing, with an upside and a downside. When flying in the wheels down orientation, the foil wings are generating lift by virtue of the longer upper surface creating a relative vacuum. When flying upside down, the lift is generated only by angle of attack. I think there may be a difference between these, which leads me back to the symmetric cross section GP. I still wonder whether there is any foil type lift operating, as seems to be claimed sometimes. *************************************************************************** PaddleWise Paddling Mailing List - Any opinions or suggestions expressed here are solely those of the writer(s). You must assume the entire responsibility for reliance upon them. All postings copyright the author. Submissions: PaddleWise_at_PaddleWise.net Subscriptions: PaddleWise-request_at_PaddleWise.net Website: http://www.paddlewise.net/ ***************************************************************************Received on Wed Dec 05 2007 - 12:31:42 PST
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