Join Date: Mar 2006
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The problem with that idea is that the bulkhead is important in supporting the hull and cabin in resisting torsional loads as well as supporting the cabintop against both compressive and tension forces. If the bulkhead is rotted to that degree, then the entire integrity of the hull and cabintop is compromised IMHO.
The mast step pushes down on the cabintop in the center—the bulkhead may well be the part that transfers the loads from the cabintop down to the hull and keelson. If it is rotted, the addition of a larger chainplate does nothing to solve this problem.
The chainplates pull up and in on the bulkhead and if the bulkhead is rotted, the way the inward and upward forces are transferred to the hull will cause point loads that would be lessened were the bulkhead intact to spread the loads over a greater area of the cabintop.
Sistering the bulkhead is almost as much work as replacing it properly, and changes the alignment of the loads and where they are transferred.
Finally, as the loads generated by sailing cause the boat to twist, the bulkhead connects the cabintop to the hull and prevents any real movement of one in relation to the other. If the bulkhead is rotted, then there is nothing to help tie the two parts together and the cabintop may shift or warp under higher loads.
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You know what the first rule of sailing is? ...Love. You can learn all the math in the 'verse, but you take
a boat to the sea you don't love, she'll shake you off just as sure as the turning of the worlds. Love keeps
her going when she oughta fall down, tells you she's hurting 'fore she keens. Makes her a home.
—Cpt. Mal Reynolds, Serenity (edited)
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Still—DON'T READ THAT POST AGAIN.
Last edited by sailingdog; 04-05-2010 at 11:02 PM.