bertram31.com

Is coosa board a good product to use for rudder tables? I know I read something here about this product but can't find it on search. thanks Russ

Coosa will be fine if you heavily reinforce it.

This is the way I'd would do it:

2 pcs of 1/2" Coosa laminated together with 1208 biaxle fabric, (45/45 weave).

Laminate both exterior faces with 1208, lightly sand, round over the corners, and cover the whole thing with 1 1/2 oz chopped strand mat. Sand that to a smooth surface and add a coat of resin to fill in pin holes.

Ready to paint, gelcoat, or finish as I like. I'd do it all in polyester resin to that point...

Pat thanks for the come back. just trying to cover all bases with the new boat...Russ

Can it also be used for the bulkhead just aft of engines and the cockpit deck supports ?

The bulkhead, yes. That's what I used on the current B31.

Structural supports, yeah maybe if you designed 'em right and glassed 'em up good. But what I used was 2" structural square fiberglass tubing, 1/8" wall thickness, for the vertical supports. The horizontal, (fore to aft), I constructed 1/2" plywood I beams, epoxy glassed over and capped with structural fiberglass channel.

The structural fiberglass was procured from McMaster-Carr

mcmaster carr, used them awhile back for a certain size spanner wrench, orderd a doz, was at the job in 2 days, excelent co.

I also have to chime in on mcmaster carr. Every time ive ordered from them ive had the order in 1 or 2 days with standard shipping. They have been great in my experience. I just wish they would let a small guy like me have a catalog.

thanks for the info ... and McMaster looks great

McMaster is very good. We use them often. Work is allowed to have an account there as opposed to the $%ck@#s at Kellogg.

You may not need a catalog as they have a great website.

If you need one, I have tons, just give me an address.

They being an industrial supply house, and we being industrial, its a useful resource! That and MSC, and many others. All depends on what you are looking for!

D

I fabed mine out of 2 pieces of 3/4 x5" coosa board glued together with eooxy, I screwed a piece of 3/4x 5" and glued it as a top/ tee section. for the uprights , 3/4 x5" going from hull to the underside of the tee /top section and laminated a piece on the inboard side that basically set on top of the longitudinal stringer and continued up to the underside of that tee section, refastened with carriage bolts, gave everything a coat of Sherwin Williams White self leveling epoxy ,easy to fasten the decking back down on to

McMaster Carr has 26 density Coosa board too! They are great.

Just completed a rudder shelf w. coosa-

Looks great-

How do you post pics?

Thanks,

How do you post pics?

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Capt Pat, do you have to use epoxy/mat on the coosa board surfaces(for deck hatches),or can you just apply nonskid and finish over existing board, and why?

I know of one guy in Palm Beach, (actually the guy that put me onto the Coosa Board type product almost 8 years ago), that doesn't glass over it. Just fills, sands, primes and paints...

But for me, I prefer to glass over it. A large hatch or unsupported area certainly needs glass both sides to insure enough composite strength.

Thanks Capt., will glass over then. Damn, thought I had a quick little project there!

coosa is extremely soft on dents easily, some of the commercial boats tried it and eventually recovered the deck with 1/2 coosa and a layer of cloth

Marlin yes, I did notice that it is very soft too. Tamera at Coosa told me there is one boat manufacture that uses only 1/2" and not glassed! That seems like a stretch to me, literally.