> From: "Peter Chopelas" <pac_at_premier1.net> <I wrote> >>Say our big fat WW paddle moves through the water twice as fast as the >>boat to go 4mph: > > > 8lbs * (5.87fps + 11.74 fps) = 140 ft-lb/sec = 0.256 HP. ><snip> > Your model is wrong because you are comparing the wrong forces. Actually, it was a misstaement of Jeff's model. I was trying to show the errors. Jeff's model actually stated Force = hull drag * (hull speed + slippage) >...In both > cases you used the resistance of the drag of the boat, 8 pounds, and then > multiplied that by an assumed paddle speed. You have to multiply the hull > drag by the HULL speed and you get the power OUT-put. Right. Jeff multiplied drag * (hull speed + slippage) and called that force needed to propel the boat at V. -- mike ----------------------------------- Michael Edelman medelman_at_ameritech.net http://www.foldingkayaks.org http://www.findascope.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 Wed Jul 31 2002 - 09:53:00 PDT
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