40% of a boat's weight on stands? That might work for center console but sounds too high for a keelboat. I read somewhere that the keel should support 80 to 90% of hull weight and the stands 10 to 20%. That makes sense to me as the lead keel is already half the weight of the whole boat, and you don't want to lift the hull off the keel. Using round numbers, a 10,000# boat using 6 stands (don't count the bow stand) means the keel blocks support 8000# to 9000# while each stand is loaded to 166# to 333# each. That's a lot of weight on the stands.
The Brownell boat stand site advises hand tight, so I doubt anyone is loading their stands to 40% boat weight which for my example would equal 667# each. In fact, I'm probably the only owner at my yard who keeps the stands tight. The others set 'em and forget 'em till spring. I tighten my stands evenly and in pairs, each visit and I estimate about 200# is being supported by each one of my stands, (12% overal weight). How you set them properly is easy to learn from the Brownell website, and many yards fail to follow the best practice. http://www.bing.com/videos/search?q=brownell+how+to+boat+stands&qs=n&form=QBVR&pq=brownell+how+to+boat+stands&sc=6-27&sp=-1&sk=#view=detail&mid=62FC48305AE6F6A6913862FC48305AE6F6A69138 Chuck Resolute 1990 C&C 34R Atlantic City, NJ ----- Original Message ----- From: "Wally Bryant" <w...@wbryant.com> To: cnc-list@cnc-list.com Sent: Wednesday, December 18, 2013 3:56:46 PM Subject: Re: Stus-List Raised floor boards [was Crack where keel meets hull] Some Travellifts have integral scales, so they could lower it onto the blocks until the scales read 40 percent of the original weight, and then place the jack stands. Note that the scales may not be calibrated accurately, or the operator may not really know how to use them. One time I had a travellift operator tell me that Stella Blue was a really heavy boat. He said it weighed 24,000 pounds. Now, I'll admit I have the boat overloaded for cruising, but if my boat displaces 24K pounds the waterline would be about even with the toe rails. <VBG> However, you could just use 40 percent of whatever the scale says. Wal sam wrote: > Not sure how your supposed to know when you’ve got 60% on the keel. -- s/v Stella Blue www.wbryant.com _______________________________________________ This List is provided by the C&C Photo Album http://www.cncphotoalbum.com CnC-List@cnc-list.com
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