composite chainplates

[olliric]

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

[gonzo]

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.

[Herman]

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.

[Herman]

A nice link:

http://members.cox.net/building.galene/Chainplates.html

[olliric]

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.

Originally Posted by gonzo

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.

[olliric]

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

Originally Posted by Herman

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.

[olliric]

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.

Originally Posted by gonzo

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.