Chain plate or impact. - SailNet Community
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post #1 of 39 Old 09-30-2013 Thread Starter
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Chain plate or impact.

Here's a photo from May 2013, me sanding down my 3 inch wide 2 inch thick rub rail.
[IMG][/IMG]
Here's a photo from August 2013, I was sanding the under side of the toe rail (which explains the teak dust) and found this little bit of joy.

Note the first picture is provided so you can zoom in and see it wasn't there.

There was a "del rechio" in June, which may, may I say, have caused a roll and hit to the piling there (it's fended off with a 9 inch diameter fender.

Irwins have embedded chain plates, no way at all to inspect without a grinder and a chop saw.
I have a surveyor with a thermal imager scheduled in, any ideas, hopes, prayers and donations?

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post #2 of 39 Old 09-30-2013
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Re: Chain plate or impact.

Can you remove the chain plates and mount them on the outside of the hull? It makes for easy inspection, no leaks and will practically eliminate corrosion. If your current chain plates are embedded on the inside of the hull (as I understand it), moving them to the outside shouldn't reduce your sheeting angle all that much. Just my 2 centavos ...

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post #3 of 39 Old 09-30-2013 Thread Starter
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Re: Chain plate or impact.

I think the way "they" do it is to use the current chainplates as back plates and just bolt right through it.
Seems to me you'd still have to dig them out because they would just keep rusting.

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post #4 of 39 Old 09-30-2013
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Is that spot cored?
Usually, even with a cored hull, the structural areas are solid.
Perhaps an exploratory hole drilled from the inside?
Progressive Epoxy sells a Low V epoxy that is good for injecting into cavities to strengthen. It is good because it has no solvents that need to vaporize. Tough to off-gas when enclosed inside a core. All the other penetrating epoxies have solvents to thin them.
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post #5 of 39 Old 09-30-2013 Thread Starter
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Re: Chain plate or impact.

I've got a surveyor coming next week to take shots with a thermal camera.
After that I guess it's time for a small hole saw.
At this point I need to know beyond a shadow of a doubt if it's impact or chain plate - so I know if it's insurance or out of pocket.
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post #6 of 39 Old 10-01-2013
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Re: Chain plate or impact.

Looks like impact damage to me.

I think that to get sufficient stress on a chain plate to deform the hull locally you would see evidence on the deck as well.
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post #7 of 39 Old 10-01-2013
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Re: Chain plate or impact.

Chuck, what were the winds like during the storm? The impact may not have been the boat on the piling, but rather something that was in flight.

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post #8 of 39 Old 10-01-2013
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Re: Chain plate or impact.

I would think that if it were from an impact there would be some other damage on either the rub rail or the cap rail.. If water leaked into the chainplates at all in the past (I see a lot of silicon around them in the first photo) it is likely that they are going to have crevasse corrosion given their age. Just because chain plates are glassed in does not make them impervious to leaks, it just makes it harder to tell if they have been leaking. In this case it would not have to have had that much force to cause a failure, certainly not enough to deform the deck. The cracking looks to be in the area where the chain plates would be welded to a cross bar and the weld would be the most likely area to develop crevasse corrosion as it would naturally have a lot of nooks and crannies. This is typical of 20-30 year old ss that has lived in a marine environment.


When we pulled our plates this is what we found.. On all of them.. It was because of this that I have recently started (1 year so far) doing rigging inspections under the supervision and along side of a local surveyor. While I don't have 30+ years of experience under my belt, I have inspected quite a few rigs. There hasn't been a single one that I have looked at that was older than 25 years with original chainplates that did not have at least one with cracks (this isnt to say that they dont exist, I just haven't come across them yet) If it were me with a 20+ year old boat, with glassed in chain plates, and signs of spider cracking on the hull over one of those plates, I would sit down, pour my self a tall glass of rum, and break out the hole saw.

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post #9 of 39 Old 10-01-2013
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Re: Chain plate or impact.

could it be a hit and run? big localized stress crazing, maybe more. Probably an insurance issue!!.
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post #10 of 39 Old 10-01-2013
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Re: Chain plate or impact.

Short of your hull being made of tissue paper, I don't think it couldossibly be the result of just chain plate corrosion. If they were corroding, AND there was an impact.... But that would still fall under the insurance claim.

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