At 10:13 PM -0500 1/17/02, Rcgibbert_at_aol.com wrote: >In a message dated 1/17/2002 11:48:42 AM Pacific Standard Time, >kevin_at_yourplanetearth.org writes: > > >> Yep, the knock against my Arctic Tern is that it is a little slower than a >> round-hull boat due to the extra wetted surface area of the crisp hard >> chine. I'll take a 5% reduction in cruising speed any day for maximizing > > rough water and surfing performance! As a practical matter chines don't end up adding all that much wetted surface because they also tend to add volume which makes the boat float higher which reduces the wetted surface, so it very nearly comes out as a wash. The worst possible difference (a perfectly rectangular hull section vs a perfectly semi-circular section) for two boats of the same width and displacement is the rectangular hull has 13% more wetted surface area (if I did my math right). This is significant, but in practical terms, neither the rounded chined or hard chined are anything like "perfect". Much more important to how much wetted area there is is the width of the waterline and the overall shape of the bottom (round, flat, deep "V"). The chines have a somewhat secondary effect. > > >I agree. When travelling confused waters (eg surf, clapotis, standing waves) >I find the hard(er) chines of a Khatsalano a better ride than the round >chines of my Nordkapp. >The Nordkapp, to me, is faster, but on a week long cruise...I'm just not in >all that big a hurry. Why are you attributing the performance difference to the chine shape. Are the Khatsalano and NordKapp exactly the same except for chine shape? Isn't the Khatsalano a folding boat and the Nordkapp fiberglass? Don't they have different lengths and widths. Aren't they actually completely different boats other than being vaguely "Greenland Style". Why is it the chine shape making the difference and not some other aspect of the design? Isn't that like tasting an apple and an onion and saying the apple tastes better because its red. It would be just as wrong to assume the chine shape has nothing to do with the performance. Performance is dependant on hull shape and the chine is part of the hull and thus must have some effect on the performance. But, there is so much more to the hull than just the chine. Why insist that one aspect trumps everything else? Nick -- Nick Schade Guillemot Kayaks 824 Thompson St Glastonbury, CT 06033 (860) 659-8847 *************************************************************************** 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 Jan 18 2002 - 07:48:26 PST
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