Moving chainplates outboard (from "through deck" configuration), I have a question.. - SailNet Community
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post #1 of 57 Old 02-21-2011 Thread Starter
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Moving chainplates outboard (from "through deck" configuration), I have a question..

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post #2 of 57 Old 02-21-2011
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Chris—

Without the support of the toerail, the chainplates are far more likely to flex and if they do, it will cause the chainplates to fatigue. I think you do need to incorporate the chainplates into or with the toerail.

Don't forget, the angle of the mast tangs needs to be modified to match the angle from the new chainplates, which are now further outboard.

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post #3 of 57 Old 02-21-2011
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I've seen some older boats with outboard chainplates that have a sort of "rub-rail" (for lack of a better term) below the toe-rail, with the chainplate bolted below that. The chainplates bend over the top of this rub-rail, and are thus held just outboard of the toe-rail.

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post #5 of 57 Old 02-21-2011
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I too like the idea of moving the chainplates outboard...

but eventually compromised on this;



Full saga here

Boat is a Whitby 42, big daddy to your Alberg 30.



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post #6 of 57 Old 02-21-2011
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You will sacrifice a few degrees of pointing ability with the chainplates mounted outboard. Not a disaster but something to be aware of.

I think chainplates can be seaaled properly through the deck. gtod's link is one example. The other issue is that most leaky chainplates have been ignored for 20 to 30 years. Properly done, which requires the most work, will take the longest time. Pulling them for inspection in 10 years and rebedding them won't take as long.

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Quote:
Originally Posted by mitiempo View Post
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Bingo!

I've also seen set-ups with wood blocks under the chainplates to avoid the extra bend over the "rub-rail" (is there a better word for that?).

Never forget them. Do something to prevent it from happening again.
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post #9 of 57 Old 02-21-2011
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I usually stop and think real hard whenever I'm contemplating changing something the guy that designed the boat thought was important. Just sayin.

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post #10 of 57 Old 02-21-2011 Thread Starter
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Quote:
Originally Posted by jrd22 View Post
I usually stop and think real hard whenever I'm contemplating changing something the guy that designed the boat thought was important. Just sayin.
Na, this ones easy jrd... there is no reason that I cannot get the tangs to be within an inch of where they currently are, so no geometry changes will happen, just structural strengthening of the "known to be weak" Alberg 30 chainplates.

No one questions the reinforcing of the cabin top from the inside where the mast step is on Alberg 30's (the famous aluminum beam retro fit), nor should it be a problem to move the CP's outboard. I just have to make sure the rigging alignment stays the same, which like I said ...should be easy...
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