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post #3 of Old 09-15-2003
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30ft Catalina


That''s a nice explanation of mast dynamics. I''m interested in your preference for a "moment connection" (by which I presume you mean what my engineer friends call end fixity, as opposed to pin fixity, if I remember right?) at the mast to deck connection. You describe the mast heel bolted thru the deck to the jack/compression post. In the event of a lost rig, this seems like a disaster for the deck as first the heel is ripped out of the deck, and then the compression post, too.

And is there any gain beside a marginally stiffer bottom mast panel? On a three panel, two spreader rig, the additional stiffness applies to the lower third of the lower panel, and is that really a benefit? It seems like an S-shape might result from a rig so supported, once substantial backstay is applied, that is the head goes aft, the middle forward and the bottom remains fixed at the initial rake. Is there any sail shape benefit to this? Or any other post-rig-loss benefit, presuming the heel can be made not to rip out of the deck?

I''m just curious what your thinking is...

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