Kevin wrote; > >I do not understand why the lift generated by Greenland paddles must >necessarily be small. My fluid dynamics is pretty weak, but if someone >wants to give me the calculations of the lift force vs. the drag force, I >would be very appreciative. I am not sure it is "small" or even large either but P.S. Jackson has done some work on this and (if I recall correctly) he claims a propulsive efficiency of 0.86 for the flat blade drag style of paddle and 0.92 for the wing. That may be enough to produce the "concrete" feel in a lifting blade. Does the Greenland paddle and stroke produce as much as the wing? Good question. In any case, if 1.00 is 100% efficiency then the 6% difference amy be all you ahve to workl with since 100% efficiency is a dream at this point. One can draw ones own own conclusions about what is "small" and "large" . Cheers, John Winters Redwing Designs Specialists in Human Powered Watercraft http://home.ican.net/~735769/ *************************************************************************** PaddleWise Paddling Mailing List Submissions: paddlewise_at_lists.intelenet.net Subscriptions: paddlewise-request_at_lists.intelenet.net Website: http://www.gasp-seakayak.net/paddlewise/ ***************************************************************************Received on Fri Jul 24 1998 - 09:46:20 PDT
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