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Thread: chain plate position question

  1. #1
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    Default chain plate position question

    ok, its time for the "dumb question of the week"....

    I can't seem to recall what 'method' I used to prescribe the positioning of chain plates.
    I would tend to think they would be "in-line" with the standing rigging. So in effect some plates might be canted somewhat (ever so slightly in my case).
    I'll be using deadeyes and lanyards.
    Im doing up the patterns now in readiness for casting at a later date when I can find a suitable foundry.

    Bern

  2. #2
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    Default Re: chain plate position question

    Yes, in line with the shrouds. I seem to remember a figure of 10 - 15% of the distance from mast to forestay, aft of the mast. Which may be incorrect, but sounds about ok for a small boat.

  3. #3
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    Default Re: chain plate position question

    I think you are correct about them being in line. Will you have running backstays?

  4. #4
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    Default Re: chain plate position question

    Not shown in the plans?

  5. #5
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    Default Re: chain plate position question

    The location of the chainplates really should be on the plans. It matters a lot.

    If theyre a few degrees out of line with the shrouds for structural or aesthetic reason, Id think it OK.

    Why not make chainplates from bar stock? Id think them less costly and more reliable than castings.

  6. #6
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    Default Re: chain plate position question

    Meg's chain plaits are bar stock, external to the planking, and backed inside by threaded bar stock.

  7. #7
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    Default Re: chain plate position question

    I just finished making the second pattern. I only need two but will get 4 off one and 2 off the other when cast. This gives me top mast shroud and two lowers (fore and aft).

    I prefer to make up cast patterns as I need to account for the change in angle over the sponson etc. They will be cast in Nickel Aluminium Bronze which is harder than gunmetal bronze and does the job well. I just bolt through and back up with a hardwood block.

    The location of chain plates isn't in the plans unfortunately. The reason being is that the set of plans I have is for the 28' Susan which is the schooner version. Im building to the Katy design which is the 30' Cutter.

    In any case, I made my patterns today and fitted them in place where I think they will be required. There was just a 5mm height difference (due to sweep of deck) which made me want to make the two patterns. Overall though, the placement is not overly critical as the distance between all three is roughly about 1m or so ( I haven't measured it).

    The plans only call for the two shrouds but I'll likely put in a second lower.

    And yes, I will have running back stays. Ive had these previously on high field levers but found the system can be dangerous for fingers and clumsy at times. To be fair though, the mainsail on Pequot and Decatur were quite large and their booms were long. On this little yacht I'll be running rope and block system. I think this will have its own issues in that there's probably going to be a lot of rope about the deck.
    Last edited by Bernadette; 03-24-2021 at 05:38 PM.

  8. #8
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    Default Re: chain plate position question

    If yer gonna have deadeyes...why have chainplates ?

  9. #9
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    Default Re: chain plate position question

    Quote Originally Posted by wizbang 13 View Post
    If yer gonna have deadeyes...why have chainplates ?
    is this a 'terminology' issue? in any case, Ive got to have something to attach the lower deadeye to....

  10. #10
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    Default Re: chain plate position question


  11. #11
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    Default Re: chain plate position question

    right, now I see what you are on about.
    bit too late for me with the cap rail already in place so I'll stick with what Im doing.

  12. #12
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    Default Re: chain plate position question

    we got sawzalls for pesky decorative caprails

  13. #13
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    Default Re: chain plate position question

    no thanks. I rather my style than yours.

  14. #14
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    Default Re: chain plate position question

    Quote Originally Posted by wizbang 13 View Post
    Good you describe the structure below deck if that picture?

  15. #15
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    Default Re: chain plate position question


    3 lams of one inch white oak. If I could do them over again, We might go more /thinner lams of more durable wood.
    Apologies for the drift Bernadette.
    edit...geeze, i can see 3 packets of "Hillsboro ", Dominican ciggys in this one photo.
    Last edited by wizbang 13; 03-25-2021 at 06:29 PM.

  16. #16
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    Default Re: chain plate position question

    drifting is ok by me.
    I was working on my chain plate pattern this morning but had to stop due to power outage....arrggghhh.

  17. #17
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    Default Re: chain plate position question

    Maybe a non-sequitur, but the internal chainplates on my boat are 3/8 x 2" bronze attached to frames & also bolted to a 1 ft. x 3 ft 3/8 plate that's also screwed to frames.

    Thing was, they come straight through the deck & leaked. I made bronze rectangles with cutouts in the center about 1/4" bigger than the chainplates - filling the gap with (yes - one of 2 places I use it) 5200. Haven't leaked a drop since.
    "If it ain't broke, you're not trying." - Red Green

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