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 Replacing Chainplates

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Gary
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PostSubject: Replacing Chainplates   Sun Jun 10, 2012 12:21 am


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PostSubject: Re: Replacing Chainplates   Sun Jun 10, 2012 6:58 am

Interesting discussion. Interesting to learn about the bolt concerns.

I am, right now, re-evaluating bolt options for Gones' new plates. I want the look of the carriage but have 21 round holes all ready.




Could not find a punch in my area so I had them drilled. The shop was supposed to bevel the edges to accommodate the carriage shoulder. Didn't happen and I didn't have time to argue. Contemplating buying a die grinder or just goin w/ a more standard bolt.

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1977 CM32 Sloop "J.F. Gone" Currently in re-fit, splashing 2013
1972 South Coast Seacraft 26 S/V "Seaweed" on the hook in Key Largo pirat
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PostSubject: Re: Replacing Chainplates   Sun Jun 10, 2012 8:38 am

It never occurred to me the chainplates could fail. My chainplates were moved a bit on the starboard side. You can see the filled and repaired holes in the fiberglass.

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PostSubject: Re: Replacing Chainplates   Sun Jun 10, 2012 10:16 am

Typically failure is where they pass through the deck on those type of plates. Oxygen starvation and stress from rigging tension causes metal fatigue. Stainless often just snaps rather than giving tell tail cracks or stress marks. Stainless rigging is the same. Use of toggles helps relieve the stress at the top of the plate where the stays attach as well as relieving stress on the wire.

Outboard chain plates don't suffer the corrosion problems as far as I know. Also they don't create leaks in the deck. I am changing Gone over.

Found these bolts that I may go with. Not quite the look I want but much simpler to use.

http://www.boltdepot.com/Socket_button_head_Stainless_steel_18-8_3_8-16.aspx

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1977 CM32 Sloop "J.F. Gone" Currently in re-fit, splashing 2013
1972 South Coast Seacraft 26 S/V "Seaweed" on the hook in Key Largo pirat
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PostSubject: Re: Replacing Chainplates   Sun Jun 10, 2012 11:12 am

This advice is not going to do you any good as you have your chainplates made already but a longer chainplate where a new set of additional holes are added lower on the hull would be a good idea to give the boat a different set of stress points in the fiberglass. I will go that route when I replace mine. I will also be replacing the mainstay connection point. I may be using the roller furling on the shorter mast by not modifying anything except making the bow longer. Clipper Marine 33? Lol. It will end up a 36 or 38 after I add a sugar scoop stern to protect the rudder from other boaters and give me a way to climb out of the water.

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PostSubject: Re: Replacing Chainplates   Tue Jun 12, 2012 5:37 am

Actually the new plates are a couple of inches longer than the original. I don't recall any of the holes matching the existing and the bottom hole is, as you suggest, a couple inches lower than spec.

I will be glassing in backing plates in a web manner to spread the load. Likely overkill but I will feel better about it in rough conditions. Will help make her more forgiving to our mistakes. Wink

~~~~~ClipperMarine.Org~~~~~Clipper-Sailor.net~~~~~
1977 CM32 Sloop "J.F. Gone" Currently in re-fit, splashing 2013
1972 South Coast Seacraft 26 S/V "Seaweed" on the hook in Key Largo pirat
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PostSubject: Re: Replacing Chainplates   Tue Jun 12, 2012 11:19 am

Excellent. When I redo mine this fall/winter/spring I will measure my side stays and make them a foot short. The gap it creates I will have a stainless steel plate made the length of five chainplates (adding two) so ruff numbers 4' x 1' tall. Cut into the plate will be the name Clipper Marine 32. I have it designed into my head. The added chainplates will be at a 45 degree angle to prevent side to side motion of the three main chainplates.

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PostSubject: Re: Replacing Chainplates   Tue Jun 12, 2012 12:40 pm

Sounds interesting Gary. Would love to see a drawing.

~~~~~ClipperMarine.Org~~~~~Clipper-Sailor.net~~~~~
1977 CM32 Sloop "J.F. Gone" Currently in re-fit, splashing 2013
1972 South Coast Seacraft 26 S/V "Seaweed" on the hook in Key Largo pirat
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PostSubject: Re: Replacing Chainplates   Tue Jun 12, 2012 1:13 pm

Has not left my head yet! lol

in theory, it does not need to be longer to make it stronger. By tying the three chainplates together, that already greatly increases the strength. The added two are more for increasing the size of the nameplate.

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