There are alternate explanations of why a paddle may leave the water ahead of where it entered the water that do not involve lift. For example if the tip of the blade is slightly forward at the catch, the blade will slice down and forward. Then if the center of effort is below the water surface, the blade will rotate approximately around the center of effort so that the top of the blade near the surface moves forward even if the center of effort moves back. Then at the end of the stroke if the bottom tip of the blade is slightly behind the blade will slice up and forward as it is recovered. As a result, if you look at the point where the paddle entered the water it may appear that the paddle is removed ahead of that point even if the main body of the blade below the surface travels backwards during the stroke. This kind of motion does not mean that there is no lift, just that lift is not required to make the paddle exit ahead of where it entered. On Thursday, June 12, 2003, at 10:25 PM, Robert Livingston & Pam Martin wrote: >> Playing it in slow motion revealed clearly (and caused some open >> mouthed >> staring at the screen) that both the paddle and the boat were moving >> forward >> in relation to the water (the paddle less so, of course), i.e., the >> paddle >> moved in the direction of travel of the hull between the catch and >> the >> finish (of the stroke). > > This may have been the impression created by viewing the video. This > interpretation is radical enough that it requires strong proof and I > have > trouble with accepting people's impressions of events because people > see so > many extraordinary things that turn out not to be true. > > This is not intended as a slam against Ralph who might be right but > this is > not real "data" in a scientifically acceptable sense. Nick Schade Guillemot Kayaks 824 Thompson St Glastonbury, CT 06033 USA Ph/Fx: (860) 659-8847 http://www.guillemot-kayaks.com/ *************************************************************************** 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 Fri Jun 13 2003 - 05:49:06 PDT
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