Laminate drawings and schedule for 52 ft coastal catamaran

Seems You do not really have a design. There is an (incomplete) 3D and number of hydrostatic files quick generated by computer...

In our experience, design of similar size/type of boat is this:

 

I don't understand why you are not happy with the existing laminate, the foam densities and e glass fabrics all seem appropriate materials for the intended use and layup method.

How light do you want to spend ?

Any materials supplier will be able to recalculate a lighter or cheaper laminate based on the existing schedule.
Just a final point you will get marginal value for money with carbon in a wet layup, but if you go infusion everything changes, but dependent on the skills and budget at hand.
RR

 

No.
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Why not ?

 

May be not any materials supplier, but some can & have skilled NAs & Composites Engineers working for them, SP Systems springs to mind. Jeff.

 

Oh well of course not any, any reputable......

 

Here's a thought or two.
Will your designer/engineer put an insurable warranty on the design/construction.
In other words do they have liability insurance to cover what there offering.
Does the structure in any way comply to any standard, and make the vessel insurable.

 

How thick is the core?
In broad terms a thick core with light skin can achieve same panel stiffness as a thin core with heavy skin.
Where furniture, floors webs etc are placed will also help with panel stiffness

 

Will "help" with panel thickness? The spacing and arrangement of the webs is just as important as the panel thickness. Perhaps even more important. That's why they are called stiffeners. I find it easier to modify stiffener size and arrangement than to play with laminates. You can fine tune stiffening much easier than laminates or cores.

This is all basic engineering section modulus/moment of inertia stuff. This is easier to understand with an isotropic material such as steel but it works the same with FRP. In general increasing the number of stiffeners and thereby reducing the thickness of the panel will reduce the weight of the overall structure for the same strength/stiffness.

Increasing the core thickness will greatly increase the stiffness because you are increasing the distance to the neutral axis. Increasing the skin thickness will also increase the stiffness but far less than increasing the core thickness as you are not moving as far away from the neutral axis. Adding one inch of core thickness will have a similar effect on the stiffness as adding one inch of skin thickness, but you will add substantially more weight. I think I'm becoming more confusing instead of helping so I'll stop.

 

Structural grid rendering for design...there may be the need to add an additional ring frame between first two bulkheads either side as well as in galley/salon of each hull as well (based on core thickness and laminates)?

 

There are quite big panes (seen on sides), I believe those will not comply to ISO12215-5. This is sample of structural arrangement for our 60' that shows structural elements in the hulls.

 

Alik,
Does look like your 60 has quite a bit more structure though I can't tell that well precisely from the image. What is lightship displacement for that design? And what size core? If you don't mind sharing...

 

This boat is 17.3t lightship (this includes tender, jetski, some teak finish, etc.) and 23.2t fully loaded. Structure itself is 9t including accommodation bulkheads and built-in furniture. Core is H130, H100 and H80 25 and 19mm depending on hull area.

What I see from Your sketch, side panels will not comply unless You have unusually thick core.

You should run full structural analysis and obtain proper structural plans and lamination schedule; asking advice on forum has no meaning.

 

C'mon guys! Isn't it obvious that there is no designer. This guy drew this boat himself on a yacht design software package. Obviously he has some experience with design software but no boat design experience. He went at the whole thing *** backwards and is trying get enough info to reverse design and salvage his drawings. I'm being blunt her but seriously...it seems so clear. Any way you look at it it is a disaster in the making.

 

Wow, this is a rough crowd tonight....
First of I know didly squat about CAD or any design software. These are just screen shots of design work that I PAID $$ for that I can pull up using my rhino viewer on iPad. It's true that I did not walk into a design firm in the normal fashion and have the work done... Duh!! Would I be here asking advice if I had... So we are left with fact that I have interesting but incomplete build plan that I am looking for advice and assistance with.
Sad to see that not everyone is willing to help.

Thanks for the info on your 60 ft cat Alik... Now I can run off and start my build tomorrow... (insert sarcasm here)... Come on?? Is that what you really think...

This boat was designed at 20,000 lightship... Is 3/4 divinycell H80 and H100 really too thin? With skins of 30-34 oz each side?