Chain Plates and Mast Tang Question - SailNet Community

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Old 08-20-2013
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Chain Plates and Mast Tang Question

Why are chain plates built and installed with a much stronger design than the tang they attach to on the mast? Most sail boats have a very long and large cross section chain plate held with many bolts, then it attaches to a relatively small tang held by one bolt on the mast. We seem to concentrate most on the condition of the chain plate but what about the mast tangs and bolt?
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Old 08-20-2013
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Re: Chain Plates and Mast Tang Question

the many bolts are because of the material that they are attached to. the fiberglass or wood hull/ bulkhead are no where near as strong as the aluminum mast material
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Re: Chain Plates and Mast Tang Question

Quote:
Originally Posted by overbored View Post
the many bolts are because of the material that they are attached to. the fiberglass or wood hull/ bulkhead are no where near as strong as the aluminum mast material
Good point...
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Re: Chain Plates and Mast Tang Question

But the interesting thing it always seems the chain plate fails by cracking right at the deck penetration. I realize that with stainless this is probably due to stress corrosion cracking. So if I use say silicon bronze, would this not be a better material? And I would think the small mast tang would see a lot of fatigue failures as the mast (even in a well tuned rig) has a lot of movement due to normall stresses it sees.
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Old 08-20-2013
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Re: Chain Plates and Mast Tang Question

I replaced all the tangs before going offshore. Earlier this year when I had the mast out I found a tang at the mast head with a small crack, replaced this one as well. So, yes the tangs do fail....
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