Chain plate or impact. - Page 3 - SailNet Community
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post #21 of 39 Old 10-07-2013
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Re: Chain plate or impact.

An update would be great.....
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post #22 of 39 Old 10-07-2013
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Re: Chain plate or impact.

I do know that Seafever pounded on some piles hard enough at some point in in its past when its mooring chain failed and broke open most of the starboard side of the boat

There was not really much obvious external damage as the rubber rub rail hid it very well

It was not obvious how bad it was unit I stared re-coring the foredeck section of the hull and I was able to lift the deck by hand






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post #23 of 39 Old 10-07-2013 Thread Starter
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Re: Chain plate or impact.

Friend of mine with a lot more experience than me took a look over the week end and proclaimed it impact, minor and I was a wuss (I stopped all sailing in mid-august when I found it).

I'm waiting for the thermal imaging - should be Wednesday.
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post #24 of 39 Old 10-11-2013 Thread Starter
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Re: Chain plate or impact.

The survey is done, I don't have the report yet so I can't share the images.

Per the verbal report all my chain plates show signs of moisture intrusion - and we found additional spider cracking (less obvious) at other plates - some in the white gel below the cove stripe (blue).

The only good, dry plate is the forestay.

I reckon I'll be in the vendor tents at the boat show, talking to riggers


At this point I'm not sure if I'll be going at them from the inside or the outside.

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post #25 of 39 Old 10-11-2013
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Re: Chain plate or impact.

Did he look through the hull, too? If so, was that chainplate broken?

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post #26 of 39 Old 10-11-2013 Thread Starter
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Re: Chain plate or impact.

Jim,
I saw no images that indicated a major imminent collapse or disjointed chain plate.

I'm perhaps operating under an abundance of caution, but I always handle safety issues that way.
I have no training in thermal image reading (and I didn't stay at a Holiday Inn Express), but I do have a minor bit of metallurgic training including NDI from my days as a USAF Metals Processing Specialist in my early 20's. I think by the time a thermal image would show a break I'd be picking up mast pieces.

With encapsulated plates it's not like a weak spot can develop and part of the plate pull upwards, the entire surface area of the plate is essentially glued to the hull.
The good, and confusing news is that other than gel coat cracking - there is no sign of movement or delamination.

Obviously I'm continuing to educate myself on this.

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Re: Chain plate or impact.

Chuck,
As you are aware, I'm new to all of this, so please forgive any naievity in my questions. I understand that there is some water in that area, that make sense to me. All boats leak, you're going to see water around the chainplates. How far away, how much, etc., is another story, but I find it hard to believe that any boat will be perfectly dry, especially around an area like that that is subject to dynamic loads. The deck penetration is a weird shape and it's got to be tough to keep that properly sealed (not that you shouldn't try!).

But what I don't get is how the surveyor connects the moisture at the deck to the problem you showed in the picture. If it was winter, I could understand that water got into the area, froze, and then created the cracks you saw. Obviously, that's not the case. Is the surveyor saying that the water also penetrated deep enough that it weakened the chainplate/hull joint so that the forces were concentrated on a small portion of the chainplate? If so, is that cracking near the bottom of the chainplate?

Sorry, I don't mean to dwell on this, just trying to learn.

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post #28 of 39 Old 10-11-2013 Thread Starter
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Re: Chain plate or impact.

I honestly don't have an answer at this point Jim.
I know (and knew when I bought it) that at some point there was a leak in the area of one plate.
Like you I know all boats leak, somewhere, sometime.

I can understand water leaking around a chain plate's cover and corroding the top couple of inches of my cap plate (teak) and bulwark (4-6 inches high in that area - and that's before it gets to the 'hull' or the deck level.
How is would continue down the encapsulated - which I take to mean solid fiberglass and resin wrapped plate and then delaminate of cause movement enough to crack gell coat - I'm thinking that's rocket science and only a grinder can tell.

Unfortunately, but the time I have it ground out to see if there's a problem, well it will need to be replaced won't it.

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post #29 of 39 Old 10-11-2013
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Re: Chain plate or impact.

Take them out from the inside - don't even THINK about going through the outside. Remove them intact and take them to a machine shop that does stainless - they can simply cut new ones from bar stock and use yours as a template for any drilling.

Sand and polish the new ones then get them electropolished - they will outlast you.

The simplest install would be to drill through from outside the hull and mount them in their original places inside the hull (after grinding those areas smooth).
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post #30 of 39 Old 10-11-2013
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Re: Chain plate or impact.

How about a few layers of glass added inside before re installing to spread out the strain .The crazing on the outside is caused by flexing, no?
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