Jackie wrote; > Then again, maybe the boat was warped. It was a Chinook. I don't think > they are rockered, are they? They do have rocker but the boat could have been warped. When we were writing KAPER we wanted to see how the program fit the tank data. We had to find a Chinook to tale the line off and discovered the first four were so badly twisted and hogged that the lines were suspect. We finally found one that looked pretty good and were then told that there had been a change in the shape and that no one knew exactly which shape was tested in the tank. What we finally did is analyze all the boats and found that, if we ignored the twist, the predictions were all very close regardless of which set of lines we used primarily because the form coefficients and dimensions were close enough. That still didn't address the twist and it may be that a distorted boat may have caused the blip in the tank's resistance curves for the Chinook. We may never know. 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 ***************************************************************************Received on Thu Jan 29 1998 - 05:59:43 PST
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