Author Topic: External Round Chainplates Design  (Read 1205 times)

Soggy Geek

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External Round Chainplates Design
« on: August 18, 2017, 09:27:53 PM »
We occasionally get requests for the details of the round chainplates we put on Soggy Paws.  See our account of upgrading our chainplates to an external round one, and why we chose that over just replacing the original internal chainplates, here:  http://svsoggypaws.com/rig.htm#Chainplates

I just stumbled into a drawing file that someone else (s/v Imagine) made, that I downloaded a few years ago.  Their website is no longer operational, but fortunately I saved a copy.  I am not sure whether this info is in the CSY Dropbox or not, but here is the PDF and the DXF file.

I am not absolutely positive this is identical to Ron Sheridan's original design--you'd have to verify that yourself.

Sherry
Soggy Paws the CSY has been sold but not forgotten!
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Soggy Geek

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Re: External Round Chainplates Design
« Reply #1 on: August 18, 2017, 09:35:13 PM »
And a link to Ron Sheridan's posts on this subject.

http://csysailboats.blogspot.com/search/label/Chain%20Plates

Sherry
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LittleSkipper

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Re: External Round Chainplates Design
« Reply #2 on: August 21, 2017, 09:08:47 AM »
Soggy Geek,

Thank you very much.  This is just what I was looking for.  Our current Chain Plates are the original type and were renewed 15 or 16 years ago.  I am not sure we will be changing them soon but most likely while we own Contessa CSY 44 ketch. 

What is the forum's opinion?  The boat is in Grenada and we hope to sail her back to Annapolis next winter & spring.  Considering the seas and weather that time of year would you recommend renewing the chain plates sooner?   I am planning to get a professional opinion from a close friend and previous owner operator of Chesapeake Rigging Tom W.   in September.
Martin,Tracy & Jelliebean

LittleSkipper

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Re: External Round Chainplates Design
« Reply #3 on: August 21, 2017, 10:31:07 AM »
Hi Soggy Geek,

This is an FYI:   I was having difficulty loading this file "Imagine Chainplates Drawing.DXF" into LibreCAD that you attached above.  I took a look at it with "notepad" and found that its contents is a "HTTP Error 404 - File or directory not found."

But the pdf files are great!

Martin,Tracy & Jelliebean

Doug Vaughn

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Re: External Round Chainplates Design
« Reply #4 on: August 21, 2017, 03:26:37 PM »
Contemplating the chainplate replacement project. Has anyone left the internal plates in place and used those for intermediate backing plates for the new ones? Then, adding new secondary backing plates.  Seems this would add significant strength to the connection point.
Doug

Matthew Balch

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Re: External Round Chainplates Design
« Reply #5 on: August 22, 2017, 09:22:06 AM »
Hi Martin,  I would think that chainplates should last at least 25 years.  Yours have already been replaced so they could go less or longer depending on how much the boat was used, where it was used, how well maintained, the quality of the materials & design, etc.  They are easy to give a cursory inspection, and as long as you do not see an issue, they are probably just fine for a number of years, in my opinion.  Mine were replaced about 10 years ago and they are still perfect.  Matthew

Soggy Geek

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Re: External Round Chainplates Design
« Reply #6 on: August 25, 2017, 01:42:31 AM »
Little Skipper, sorry the DXF file is no good, but hopefully the PDF will give you what you need.  I confess I never opened that file--just downloaded it from someone else's website, and that website is now gone.

Sherry
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http://svsoggypaws.com/CSY/

LittleSkipper

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Re: External Round Chainplates Design
« Reply #7 on: September 02, 2017, 07:12:56 AM »
Soggy Geek,
Sorry for my late response.  No worries; the effort was much appreciated as were all the other files.
Martin,Tracy & Jelliebean

LittleSkipper

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Re: External Round Chainplates Design
« Reply #8 on: September 02, 2017, 07:29:37 AM »
Hi Matthew,

Thank you for your positive response.  I appreciate your thoughts. Contessa was not sailed too hard over the past 9 yrs or so.  I will be visiting Contessa with a USB borescope 5.5 mm and dental tools to dig out the caulking.  I hope I can get a good look a the hidden parts.  From what I have read here and other sources, it is those parts you can't see or more importantly does not get air/oxygen that will in time cause the problems. 
Martin,Tracy & Jelliebean

LittleSkipper

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Re: External Round Chainplates Design
« Reply #9 on: December 11, 2017, 03:09:34 PM »
I recently worked with Erik at DIGITAL FABRICATION RESIDENCY.  I contracted with Erik to produced CAD files for external chain-plates for the CSY44.  These are the 10" round external plates but look a little different than what has been used on Soggy Paws and Beaujolais.  I put them in the Drop box because they are to big to attach here. Look into Dropbox\CSY Info\CSY 44\Chain Plates

Also, I have quoted waterjet cut 316 SS chain-plates from Alaskan Copper.
1/2” would be $137.35 ea.
3/8 would be $108.94 ea.
2 - 3 days to water jet
This is only waterjet cutting no flathead counter sink,  radius on the edge, polishing, or bend.
Don't forget to add shipping.  That will cost me another $600 from Seattle to Grenada.
Martin,Tracy & Jelliebean

Doug Vaughn

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Re: External Round Chainplates Design
« Reply #10 on: December 21, 2017, 06:09:38 PM »
Little Skipper, Thank you for the addition of the chainplate drawings. I am about to undertake the project and have a quote from Fowler Metals in West Palm Beach of $1400 which includes 1/2" 316 SS cut with water jet including the square holes for carriage bolts and bending with a rounding of all edges. The only item not included is polishing which I will do. I do see you have a 10" diameter with a nice curving shape up to the top in 1/2" ss. The Imagine drawings show an 8" diameter with 3/8" ss plate. I had them cut a test plate out of 18ga. material just to get an idea. I'll be going with the 10" diam.
Keep us posted on your progress, I'll do the same.
Doug

svsurprise

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Re: External Round Chainplates Design
« Reply #11 on: December 25, 2017, 08:34:47 AM »
Good Morning and Merry Christmas,
A simple question for those who have undertaken the job of upgrading their chainplates.  Is it possible to remove the original chainplates without removing the rub rail?  Are the bolt heads captive or should I expect them to rotate while removing the nuts from inside the hull.
Thanks,
Don

MY TIME

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Re: External Round Chainplates Design
« Reply #12 on: December 25, 2017, 10:22:12 AM »
Unfortunately the answer is no. The bronze rub rail has to be removed first. Then the bolt heads which are a slotted screw head have to be dug out, as they are buried in polyester resin. Also the top bolt is behind the teak trim just below the teak cap rail.
Donald Stengel hull#30 44WO

LittleSkipper

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Re: External Round Chainplates Design
« Reply #13 on: January 28, 2018, 11:12:25 AM »
Hi Doug,  I am glad you are able to use the chain-plate files I put online.  Unfortunately, we won't be using them. Not because I don't want to but because we are running out of time.  We decided to use the local skills which means our chain-plates will be external long strap type which are simpler, cheaper and quicker to fabricate.  Ours will be about 22"x4" long for the cap shroud and aft lowers and intermediate so they will extend below the rub-rail. The forward lower will be about 2-1/2" wide and a bit shorter.

Regarding the time element: Contessa is in Grenada and we hope to get her back to Annapolis before Hurricane season.  We are heading to the boat mid Feb. I plan to add photos here of the completed project.
Martin,Tracy & Jelliebean