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Chainplate pulling out #7544
07/03/09 03:08 PM
07/03/09 03:08 PM
Joined: Aug 2004
Posts: 24
Hingham, MA, USA
JonBurt Offline OP
Senior Member
JonBurt  Offline OP
Senior Member
Joined: Aug 2004
Posts: 24
Hingham, MA, USA
I looked through the forums and didn't see this one addressed, but thought that someone may have already been down this road, so...

My starboard chainplate has begun to pull out. The metal tang has slid more than 1/4" upwards. The hanging locker plywood is collapsing, and there are major cracks in the cabinside gelcoat, and the veneer in the cabin is wet at the chainplate area. I am sure that the core is too.

Has anyone had to repair this area of the boat? Does anyone know what the sandwich of materials are in this area?

Any/all help would be appreciated before I begin to dig in.

Thanks,
Jon
Margay - 455

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Re: Chainplate pulling out [Re: JonBurt] #7545
07/06/09 07:50 AM
07/06/09 07:50 AM
Joined: May 2007
Posts: 50
Rochester, MN
Scott Offline
Senior Member
Scott  Offline
Senior Member
Joined: May 2007
Posts: 50
Rochester, MN
I recored my bulkheads a few years ago. The core was the consistency of oatmeal in some areas...not good. I did all the work from the head and closet side, leaving the veneer in the main cabin alone. The fiberglass on both sides is 1/8" to 1/4" (sorry I can't recall the exact size). I believe the core is 3/4". There is about a 2 sq ft area that the chain plates bolt through that is marine grade plywood, the rest is the usual balsa core. It took quite a bit of work to remove the closet and head cabinets, but then you have a nice big area to work with.

I also redid the backing plate with 1/4" aluminum. It was just plastic like what was used under the stantions.

Hope this helps,

Scott

Re: Chainplate pulling out [Re: JonBurt] #7547
07/06/09 10:56 AM
07/06/09 10:56 AM
Joined: Apr 2003
Posts: 649
Marblehead, MA
dbows Offline
Senior Member
dbows  Offline
Senior Member
Joined: Apr 2003
Posts: 649
Marblehead, MA
Jon - you can get the marine plywood from Boulter Plywood in Somerville MA. http://www.boulterplywood.com/


David Bows
Mallorca - Hull# 397
~~~~~_/)~_/)~~~~_/)~~~~~~~~~~~~~~~~~~~~~~~~~|~~~~~~~
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Re: Chainplate pulling out [Re: dbows] #7565
07/13/09 12:59 PM
07/13/09 12:59 PM
Joined: Aug 2004
Posts: 24
Hingham, MA, USA
JonBurt Offline OP
Senior Member
JonBurt  Offline OP
Senior Member
Joined: Aug 2004
Posts: 24
Hingham, MA, USA
Thanks Dave and Scott, Much appreciated.

I pulled the hanging locker side fiberglass away from the core, and found it to be a combination of plywood and balsa. The plywood was in a triangular shape beginning at the hull/bulkhead interface, and continuing on about 30" across the overhead. At the bottom, it extended about 6" and then angled up to meet the top.

Mine was completely saturated, as was some of the balsa.

I replaced with marine plywood and several layers of glass with matting.

We went out for a shakedown sail yesterday, and everything seems secure now.

Thanks again for the insight.

Jon - Margay #455



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