John Winters <jdwinters_at_eastlink.ca> wrote: >>>>>Peter wrote; > Tank tests will not allow for the relative movement of the hull > of 3 or 4 knots over the water, Why? > which will very significantly affect the > flow over the blade, unless you have the water in the tank moving several > knots aftward relative to the paddle. How?<<<<<<< First I'd like to thank Peter Chopelas for the very clear explanation of how a paddle blade works in the water several days ago. We have been around this bend before but I think Peter did an excellent job this time in explaining lift and drag and their causes and relative importance in a way I could understand it. I too have questions concerning the suitability of a tank of standing water for adequately representing a paddle stroke in a moving kayak. Possibly if the tank is big enough so that the paddle and the water flow and vortexes coming from the paddle aren't being effected by the sides and bottom (or ends) of the tank a simulation could be done if the paddle is only moved with the same force it is under during a normal paddle stroke rather than the hard strokes during a fast acceleration that a paddler next to a tank is likely to actually simulate. A paddler next to the tank is more likely to simulate the tug-of-war victims than the cruising paddler. Maybe you could mount the paddler (or mechanical paddle machine) on tracks with adjustable drag and have it move as the paddle is worked in the trough. Matt Broze www.marinerkayaks.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 Sep 10 2004 - 20:56:41 PDT
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