Larry Bliven wrote: > i've read that the acceleration of water in breaking ocean waves reaches a > maximum of about 10 G. Continued slamming of ocean going boats can cause > fatigue problems... perhaps failure. > > so i wonder, what design forces are used for developing kayaks? is there any > real consideration beyound folks tossing them off of roof tops to see if > they survive... Don't know the design forces, but suspect many manufacturers use the by guess and by golly method. Example: Eddyline's cockpit area design is a weak one. Every Eddyline boat I have owned has required some sort of repair of the coaming-deck seam. Admittedly, one of those boats was oil-canned in large surf (>6 feet?), which separated the hull-deck seam tape on each side, and popped the coaming-deck seam. The others failed in normal use, from over-leveraging my fat bod out of the cockpit. I do not believe any of them would survive anything but small surf (<4 ft) if crunched sideways by a dumping wave. OTOH, I have tried to break the deck/hull/coaming area on my Pygmy Osprey Std in small surf, and it is rock solid. It is marine ply (4 mm), with epoxy/glass inside and out. Let's hear it for the structural rigidity of wood, and the strength of epoxy/glass! -- Dave Kruger Astoria, OR cockpit breaker *************************************************************************** PaddleWise Paddling Mailing List Submissions: paddlewise_at_lists.intelenet.net Subscriptions: paddlewise-request_at_lists.intelenet.net Website: http://www.gasp-seakayak.net/paddlewise/ ***************************************************************************Received on Fri Mar 12 1999 - 19:59:05 PST
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