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  #81  
Old 10-28-2013
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Re: Embedded Chain plate maint/replacement

Now that I'm done coughing fiberglass out of my lungs and picking it out of my eyes here's the update. The Navy taught me to write in BLUF style - bottom line up front.

No corrosion found anywhere. If I had not cut the chainplate into pieces to remove it I would have no problem putting it back in and using it for another 30 years.

Lots of silliness certainly. No part of the chain plate actually touched the hull proper - just the three or four layers of glass and resin that where draped over it.
In the photo's below you will see a short (3 inches per side) piece of round stock welded to the top. That was wrapped in glass and hidden right up against the overlap of the deck/hull - i.e. sneaky little last bit of 'what the heck is holding the damn thing in'.

All told - 6 hours to get the plate out - but a lot of that was expirimenting with different tools and methods. I bet I can get the next one out in 3 hours, if I bother.

Pics
all out - daylight coming in from above


Looking up - note the depth of the pocket the plate was in - and zero contact plate to hull.


Cleaned up a bit, and my chopper chisel laid in for scale


The beast. Chopping it up in manageable pieces seemed the best way to get it out.
Note the round bastard bar at the top.


Someday I will learn to focus a camera. There is no rust, no corrosion, no cracking.

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  #82  
Old 10-28-2013
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Re: Embedded Chain plate maint/replacement

This is where the bastard bar was


I could fill the page with numerous pic's of close ups of the bar's on both sides.
Frankly - no need. There is literally nothing to see. It's old, it's not polished (it was never meant to be seen), there is no sign of any deterioration what so ever.

I completed training as a metals processing specialist for the USAF in 1980. I can weld, forge,treat, bend and cut etc pretty much anything with the caveat that this was 30 years ago. That training including NDI (non-destructive inspection).
This bar is fine for another 30 years, if it was in one piece.
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  #83  
Old 10-28-2013
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Re: Embedded Chain plate maint/replacement

Was that the plate that was inline with the cracking on the outside of the hull from the original photos?
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  #84  
Old 10-28-2013
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Re: Embedded Chain plate maint/replacement

Fascinating stuff, Chuck.

So...now what?
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Re: Embedded Chain plate maint/replacement

Well,

So now Jimmy from the rigging company visited today to work up an estimate for my standing rigging.
We look at it and get to talking and planning and waving hands and such - I pull up my right angle grinder with a 1/8 cut off wheel and make a slice under the middle horizontal of the forward plate in the pictures (that's my upper shroud's chain plate). Roughly a half gallon of clear water comes out like it's under pressure.

I'll be taking the rest out, grinding the area down flat and and replacing them with through bolted plates - all but the forward lowers which would require dismantling a head and a cedar closet. The forward lowers will get weep holes, but that's it.

The conjecture at this point is the gel coat issues are because the plates were not properly attached throughout their span and length. I'm not sure I get that, but there it is.


Storm Bay - no that specific plate was the aft lower, it has a similar gel coat 'impact' looking spot below the rub rail but not in the blue area. My understanding from what Dylan is telling me is that the plates should all have been bedded in a foam like bedding compound that simply was not there.
Any way, these 4 and the backing plate will be coming out, the hull/fiberglass sheath will be ground down, faired smooth and fit to the replacement plate, then bolted through with 5 bolts each.
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  #86  
Old 10-28-2013
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Re: Embedded Chain plate maint/replacement

The gel coat issues are due to the freeze thaw cycle of all that water.
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  #87  
Old 10-28-2013
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Re: Embedded Chain plate maint/replacement

Doesn't explain why they appeared in July AT.
Clearly not there in pics from April.
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Re: Embedded Chain plate maint/replacement

This thread has been of great interest to me as I own a 1988 Irwin 38 MkII. I have the same crazing in the gel coat around the chain plates. I have attributed this to trapped water and the freeze/thaw cycle. I drilled into the glass at the bottom of one plate and water drained out.

After seeing the condition of the removed plate replacing chain plates has moved a bit down my priority list but when I do start the project it will be external plates bolted through the old ones. My only question is the number and diameter of bolts I should use? The plates are 3/8" x 2" x 24".

44Q
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Old 10-28-2013
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Re: Embedded Chain plate maint/replacement

This is a little of the basic thread but,

I looked at your chisel and noted the serrated edge. If you don't mind me asking what is the serrated edge used for?

Jon
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  #90  
Old 10-28-2013
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Re: Embedded Chain plate maint/replacement

jboart, I noticed that too. Actually, it looks like both the top and left-hand side (in the picture) of the blade were sharpened, with the left-hand edge also serrated.
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