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post #19 of Old 01-22-2012
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Originally Posted by Landgull View Post
Doug and I discussed this the other night in the chat. He was claiming that his chainplates had failed because a lack of "dynamic tuning" had caused excessive forces which exceeded the strength of the chainplates. However, by the very design and nature of chainplates, if they are intact, they essentially can not fail. Firstly, a chainplate needs to be built AT LEAST strong enough to handle the maximum righting moment of the boat. That is to say, there is no force that the wind could exert on a sail that could cause the chainplate to fail. Secondly, the chainplate should be made more strong than the shroud. While these are both "zero-tolerance failure" components, in an excessive event, you want the shroud to give before the chainplate, as that will reduce any likelihood of damage to the hull. Add in large safety factors, and it is impossible for the wind to cause a chainplate failure.
I agree, you could tune your rigging to play Stairway to Heaven in a 30 knot blow, but if your chain plate(s) fail it's because you're singing a different tune. Failure of the the chain plate has nothing to do with with how in tune your have your rigging.
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