Mike wrote: <SNIP>>>>>>Basically, to plane, you need to hit a speed/length ration of 1.5 or greater. The speed/length ratio is the speed divided by the square root of the length. This is familiar, as hull speed is defined as a speed/length ratio of 1.34. So you have to go at least 12% above hull speed to plane (ICF racers in kayaks excede this without planing - not a planing hull).<<<<<<SNIP> This is from memory, but it is my understanding that the range between a speed/length ratio of 1.5 to (something like) 2.5 (or was it 2.25) is considered the semi-planing range and that true planing is only happening at speeds above that. Fast ships such as Naval Destroyers operate in this range. So a kayak with a 16 foot waterline (and a planing hull) wouldn't be fully planing until its speed was up to 9 or 10 knots. Even Greg Barton can't do this speed in a sea kayak (but I've seen him do almost 7.9 knots in a 19' 8" long Seda Glider). I think it is considered to be true planing when the bow comes back down in relation to the stern and the boat is approaching a more level orientation again after have climbed out of its own hole in the water against the force of gravity (?using a moving inclined plane?). Matt Broze http://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 Jan 18 2002 - 00:19:33 PST
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