Join Date: Feb 2012
Location: New Orleans Louisiana
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Re: Replacing lead Keel bolts
Actually, that 5 times safety factor works for the 1/2 hanger bolts. 1400 x 5 = 7000 per bolt, which is about what i calculated was required for a 1x safety factor. So, having a 13700 lb holding capacity gives me an over all safety factor of 2x. I get a warm fuzzy with that margin.
I think you misunderstand. Each bolt assembly however anchored should have at least a 5 times safety margin.
Your assembly's week point is the attachment mechanism. So you have to design to that. If the max load the keel will generate is 7,000lbs, then you need an attachment mechanism, and bolts rated to 35,000lbs. Your design is woefully undersized.