composite chainplates

Discussion in 'Fiberglass and Composite Boat Building' started by olliric, Jul 22, 2010.

  1. olliric
    Joined: May 2009
    Posts: 22
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    Location: Canada/Italy

    olliric Junior Member

    We have just about finished modeling a 49' performance cruising cat. I want to build composite chainplates for the shrouds. In the location for the shrouds there is no bulkhead so I have to build a partial bulkhead or just attached it to the side panel. I wonder if somebody can give some advice or pointer.
    Here is a basic spec for the boat
    Displacement 9 t fully loaded.
    draft at 9t .57m
    Sail area 120 m2.
    Fractional rig with upper and lower shrouds
    Dagger boards,
    Epoxy foam duflex panel construction

    Thanks
     
  2. gonzo
    Joined: Aug 2002
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    Location: Milwaukee, WI

    gonzo Senior Member

    You need an engineering study and design. Do you mean you designed the boat by "modeling". If so, structural points should follow from the structural design.
     
    1 person likes this.
  3. Herman
    Joined: Oct 2004
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    Location: The Netherlands

    Herman Senior Member

    Why are there no bulkheads where the stays should go?

    anyhow, the basic principle is to create some stainless pipes with flanges on the ends, and align them properly. Then go over them a number of times with UD glass or carbon, and spread out the tails of the UD over a bulkhead or something else structural.

    After the work you can cut one or 2 slots in the tube, put your stays in, and put a pin in the tube.

    It needs engineering, though, although it is pretty simple.
     
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  4. Herman
    Joined: Oct 2004
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    Location: The Netherlands

    Herman Senior Member

  5. olliric
    Joined: May 2009
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    Location: Canada/Italy

    olliric Junior Member

    We have bought the boat plan and modeled with CAD to customize it. The original plan locates the shrouds chainplates on the bulkhead between the saloon and cockpit which is too far aft for good mainsail trim so I want to move them forward where there is no complete structural bulkhead. I need to have the chain plate attached to the side panel instead of on the transverse bulkhead.


     
  6. olliric
    Joined: May 2009
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    Location: Canada/Italy

    olliric Junior Member

    In my other reply I explain why there is no bulkhead. In the plan for the boat I have the details for the chainplates that go on the transverse bulkhead. Now I need to figure out the changes involved in laminating the chainplates on the side panel and probably install some additional member possibly in the direction of the shrouds load.
    Thanks for the nice link

     

  7. olliric
    Joined: May 2009
    Posts: 22
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    Location: Canada/Italy

    olliric Junior Member

    Do you know anyone that could do the study and design? Any idea of how much it would cost?
    I think that with a few hints and some common sense I could build strong enough chainplates but they will probably be overbuild. If the cost is reasonable I would love to take the guess work out of the picture.

     
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