Nick wrote; (SNIP) > >I forget if this positive AoA stroke technique was supposed to be a unique >ability of a greenland style stroke. I expect if most people examined their >stroke they would see that they do it to a certain extent no matter what >kind of paddle they use. An advantage for most people is that by angling >the power face of the paddle down they get a little brace at the beginning >of their stroke. Angling the powerface up during the exit just comes >naturally. Any increase in efficiency is worthwhile but probably not unique >to any particular paddle. > >I'll stick with my modern paddle for most of my paddling, keeping my >greenland paddles for playing around with rolls. I still have not heard any >greenland technique which I can not reproduce with my modern paddle and for >the paddling I like doing my modern blade works better for me. > I did a similar unscientific test and found that it was awkward because of the conscious effort to rotate the paddle at the correct time. Then yesterday evening I quit thinking about it and found the same thing that Nick found i.e. the angle of attack seems to change naturally although in my case the angle did not change at the midpoint but when the recovery stage began. Too much thinking seems to spoil the stroke. :-) I believe Nick's assessment of why flutter is reduced and that may explain why flutter has never been a big problem for me since I use the wing style of stroke and the paddle usually has an angle of attack less than 90 degrees. One of the things that interests me is whether the HAR paddle really has laminar flow. If I recall correctly the laminar flow type wing stalls more readily than the normal lifting sections. If some one with a good paddle can give me the offsets for the paddle section maybe I can find a similar section in the published literature that will shed some light on this. 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 Tue Jul 28 1998 - 04:48:45 PDT
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