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Sea Kayaks Techniques Bulletin Board
Re: what I gather is....
Posted By: Robert Woodard In Response To: Re: what I gather is.... (RickW)
Date: Thursday, 6 March 2003, at 9:51 a.m.
: and my car was knocked about 45 degrees. I figured the boat would have
: been torqued off of it's cradles, but once again it was as if nothing atI've been a big proponent for bow/stern lines, for just this reason. I don't think those lines will help a lot to keep a boat from coming airborne once it breaks free from the rack/roof, but they do a pretty good job of helping the rack stay on.
My reason for supporting bow/stern lines are because of torque. Lines will help side to side, but mainly up and down is where they help the most. The more narrow the distance between the front/rear rack, the more important those lines are.
I once saw someone pull into a potholed dirt parking lot with a 17 foot kayak on the roof - she had probably 2 feet between the front and rear rack and no bow/stern lines. When she hit the pothole (it wasn't very large) it ripped her rear bar off the rain gutter and slammed the bow of her boat against her hood. A stern line might have prevented it.
At highway speeds there will be torquing effects on that rack caused by the wind on the boat. Bow and stern lines will help counter those forces and put less stress on the rack to roof union. Remember that a kayak is like a giant lever on top of the car, and that the rack (the front bar when the bow is pulling down - the rear bar when the stern is pulling down) is acting as a fulcrum.
In an accident, IMHO, the bow/stern lines do most of their work in preventing torque from wrenching the boat/rack off the car. Once it does separate, it may help a little in preventing the boat from becoming a missile, but I suspect most of the skinny bow/stern lines I've seen used would just break.
my 2 cents,
Woody
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