In a message dated 98-04-22 14:21:47 EDT, Clyde.Sisler_at_wang.com writes: << The bow line has always been there just in case the rack let go and to offer some little bit of protection to those who might be near. If that did happen I would expect the boat to flap/flop back and forth to either side of my vehicle, totaling itself and doing extensive damage to my vehicle. >> All the reasons posted so far are excellent reasons for tying down, bow and stern. Am wondering --- and I think the first post talked to the issue --- what the aerodynamic effects of the hull do to the rack and the roof at high speeds. Have often thought about putting some sort of tensiometer in line with my bow line --- like, maybe a scale used for weighing fish? --- to see what the vertical lift measures in pounds. Crude measure, but the leverage provided to the rack from a moment arm of about seven feet might introduce a lot of stress --- strain? ... can't remember --- into the vehicle through the rack if a bow line is not used. And how 'bout the bending moments introduced into the hull? Anybody ever measured any of this? I'm gonna try if there's no data out there. (Maybe I could borrow the wind tunnel at Pax when nobody's looking!) Joq *************************************************************************** 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 Thu Apr 23 1998 - 05:25:20 PDT
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