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Old 28-01-2011, 09:46   #1
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Join Date: Aug 2006
Location: Hayes, Virginia
Boat: 1962 28' Pearson Triton
Posts: 289
Mast Tang vs Hull Chainplate

I've often wondered about this, so decided to finally ask. Most shrouds are terminated at the mast with a tang that attaches with a large bolt. The other end of the shroud terminates at the hull with a chainplate. The chainplates are usually larger in size (thicker and maybe wider) and attach with three or more bolts.

My question is this -- is there a difference in the load between the top and bottom that results in the difference in attachment? I'm thinking there must be, or the upper tangs would be larger and attached with more than one bolt. However, I can't "visualize" the difference in load -- why would there be less at the top? (I have a feeling I'm going to be embarrassed with the answer.)

Jay White
S/V Dove
1962 Pearson Triton, #318
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Old 28-01-2011, 10:02   #2
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The difference in load is only the weight of the shroud. The difference in attachment design is probably because the mast connection is metal to metal. The hull connection is usually to some material not as tough as metal, or more prone to distortion.
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mast, chain plate

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