At 09:45 PM 7/19/00 -0700, Matt Broze wrote: >Joan wrote: > >>>Which reminds me of a question I asked this weekend, and nobody really >had an answer: if the bow goes through the wave instead of up and over, >wouldn't you maintain speed better? (Mine goes up & over, & it seems to >me that it slows me down, but I'm not really sure...)<< > >When we get done arguing blade feather, wide vs. narrow (blades and kayaks), >paddlefloat vs. reenter and roll, Swede form vs. fishform and rudder or no >rudder we sometimes get down to this. So here is my take on it. > >The rocking and slamming caused by heave/dip motions can add considerable >extra resistance to a hull. Sea Kayaker Magazine tested five sea kayaks in >both calm water and directly into 8" high waves that were 16.6 feet long. >(Note: 16.6' long waves travel at about 5.5 knots -- the wave speed (in >knots) is equal to 1.34 times the square root of the wavelength (in feet)). >The kayaks traveled into the waves at 3 knots. There was no wind. The >waves increased the average resistance (the actual resistance varies as the >waveform passes) by about 1.5 times for the kayak that did the best and up >to 2.3 times for the kayak that did the worst. While these may seem like >small waves my videos show that most of the kayaks plunged enough to put >their bows under at times. Ok. So, what would you do to change the design to reduce the amount of bow plunging? *************************************************************************** PaddleWise Paddling Mailing List - All postings copyright the author and not to be reproduced/forwarded outside PaddleWise without author's permission Submissions: PaddleWise_at_PaddleWise.net Subscriptions: PaddleWise-request_at_PaddleWise.net Website: http://www.paddlewise.net/ ***************************************************************************Received on Thu Jul 20 2000 - 05:44:43 PDT
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