Actually, i think that even a narrow, greenland style paddle needs not to have a high aspect ratio. The notion of aspect ratio only makes sense if the paddle is used in a wing-like way. If you pull the paddle backwards without anysideward movement, so the angle of attack is 90degrees, then the paddle does not know which dimension is the length and which is the width. So the greenlander mignt be an ultra-low aspect ratio paddle.... To my feeling most paddles (even greenlanders) are used at high angles of attack, so the flow is stalled. Peter is right in most of what he says, but I do not think all of his theory is necessarily valid in the post-stal region. The behaviour of wings or paddles in the post-stal region is rather different from the unstalled behaviour. A second point is that in comparing greenland paddles and euro paddles you have to take into account the airfoil. Greenlanders usually have a thick, symmetrical airfoil. These thick airfoils have gentle stall characteristics, quite different from the flat plate or hollow cambered sections of most euro style paddles. On the other hand a high aspect ratio wing (or paddle) does stall at a lower angle of attack than a low aspect ratio one. Is there anybody on the list who volunteers to putt a few woolen tufts on his greenland paddle? I really would like to know if greenland paddles are used with a stalled flow. For what it is worth, Greetings, Merijn ****************************** Merijn Wijnen Vinkenhofje 8 5613 CN Eindhoven The Netherlands Tel.: 040-2939991 (job: 040-2650539) Fax: same as tel., call before sending or try twice E-mail: Home: merijn_at_music.demon.nl Job: m.wijnen_at_ind.tno.nl Web-site: http://www.music.demon.nl *************************************************************************** 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 Mon May 21 2001 - 09:22:59 PDT
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