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post #1 of 13 Old 04-08-2016 Thread Starter
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Hull deflection/oil canning

A 1985 S2 9.2A has been on the hard for 5 years. There is some moisture infiltration around some deck fittings but surprisingly little. My concern is about the deflection around the jackstands. One (aft port) seems to be pushed in almost an inch. Can the seriousness of this be evaluated before spending $700.00 on a survey? Thanks.
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post #2 of 13 Old 04-08-2016
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Re: Hull deflection/oil canning

Have you looked inside the hull to see if the deflection has caused any structural components to crack or separate?

Often these will just pop back out, but you can't really know for sure. Check for indirect damage inside.


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post #3 of 13 Old 04-08-2016
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Re: Hull deflection/oil canning

Yes, it might just pop back out. I would be sure it does before I purchased it. It the stand is not at a bulkhead, see if you can have the yard move it (or move it yourself with permission and knowhow).

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post #4 of 13 Old 04-08-2016
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Re: Hull deflection/oil canning

Five years ! .... pop out is unlikely.

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post #5 of 13 Old 04-09-2016 Thread Starter
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Re: Hull deflection/oil canning

Thanks - I'll get my head and a light down there somehow.
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Re: Hull deflection/oil canning

You don't need to get your head in just your phone to record video of area.
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post #7 of 13 Old 04-12-2016
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Re: Hull deflection/oil canning

As long as the depressions haven't busted the interior woodwork/bulkheads loose it isn't a structural problem. It's doubtful that it will pop back out, however. May not effect sailing qualities at all. Fix is a slurry of epoxy and micro balloons, random chopped fibers, and/or glass cloth to fair out the depression. Not that hard to do yourself if you don't mind grinding and doing lay up over your head.
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post #8 of 13 Old 04-12-2016
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Re: Hull deflection/oil canning

Not a deal breaker...when not shored properly this happened frequently...good place to beat down price a bit though. If it does not spring back completely it can be jacked out and stiffened from inside, geometry as in an angle shaped stiffener positioned to drain will work best. Epoxy albeit "stronger and having a more tenacious bond" creates hard spots. Secondary bonds using polyester are the same exact strength as hull, needs to be dewaxed and scuffed up just the same.
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post #9 of 13 Old 04-12-2016
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Re: Hull deflection/oil canning

Those kind of depressions are commonplace, generally due to poor blocking jobs. They seldom just "pop out" but they almost always will return to the normal shape in a week or two.

I wouldn't worry about it - worst case some epoxy filler is pretty cheap.

P.S. Captjcook is incorrect about poly secondary bonds being the same exact strength as the hull. Primary bonds are chemical as well as mechanical. Secondary bonds do not have the same chemical link as primaries - that's one of the big reasons for using epoxy for repair work.

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Last edited by SloopJonB; 04-12-2016 at 07:43 PM.
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post #10 of 13 Old 04-12-2016
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Re: Hull deflection/oil canning

Quote:
Originally Posted by SloopJonB View Post

P.S. Captjcook is incorrect about poly secondary bonds being the same exact strength as the hull. Primary bonds are chemical as well as mechanical. Secondary bonds do not have the same chemical link as primaries - that's one of the big reasons for using epoxy for repair work.
Please check with your insurance company about using OEM materials for repair...pro's will not use epoxy to repair poly.
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