Cruising Sailors Forum Archive

The forces are easily engineered for, and pretty well known...

but the engineering solutions used are laughable. There have been several papers published providing data on strain gage instrumented keels. The bending loads are quite manageable. Here is another analogy: I have an unstayed mast, these have a proven track record. But would you attach them by bolting the mast step through the deck? Of course not, that would require reacting the entire capsizing moment over a few inches of deck skin. Yet that is effectively what these keels are trying to do. Instead the mast is buried 5 feet through the deck and to the keel, reducing the material stress to a very manageable level.

They are trying to use yesterday's keel engineering solutions on todays keel's, even though the problem is very, very different. As used, the keel bolts are just a fuse that pops when the loads get too big. The keel should not be a fused circuit - it needs to stay with the boat until the boat is destroyed.

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