>...the color has little to do with the failure. The issue is >probably a combination of a bad batch of resin, air tight hatches, and moving >from 7500 ft. elevation to sea level plus the color and sun. Actually, the dark color (at least in part) helped. If moving the boats from 7500' to sea level really caused the problem, the color may have both helped and hurt. If you assume a 50 deg F (10 deg C, 283 deg K) temperature at altitude, the pressure difference relative to ambient (at sea level) varies between -7.3 psi (with no internal temperature change) to -4.1 psi (with an internal temperature of 120F = 49C = 322K). If heated up enough (to about 213F in this example) the pressure difference would be zero. Where the color may have hurt is in the strength of the hull. Does a fiberglass (or carbon fiber or kevlar) layup get weaker when heated to 100-120 degrees or so? I converted these pressures into feet of water to put it into a context to which most of us can relate: 7.3 psi == 16.5 feet of water, 4.1 == 9.4 feet of water. Brian Curtiss *************************************************************************** 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 Tue Apr 15 2003 - 07:42:22 PDT
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