Boat Maintenance

The overturned hull of the Beneteau First 40 Cheeki Rafiki was found in the Atlantic with its keel gone and crew missing. An official report posits that some keel bolts pulled through with their washers and other bolts broke, and that prior repairs played a role.

Through-bolting Fiberglass: An Inquiry into Failure Modes

PS tests the effects of increasing loads on through-bolts in laminate.

How much load does a keel bolt or a winch through-bolt put on a hull or a deck? How thick should the laminate be at these bolt holes? How big of a backing plate is needed?

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