What weight is the green code Divinylcell foam. I'd point out that you may want to weight the rudder so that it is neutrally buoyant or a bit heavier than water...so that it doesn't tend to float up.
I wouldn't use uni-glass in this application, since the loads are going to be multidirectional. Triaxial roving would be a good material to use...with some regular cloth or CSM over it to protect it from the fairing/sanding process.
I'd also recommend putting in a layer or two of kevlar, preferably under CSM/cloth but over the triaxial roving. The reason I'd add the kevlar is that it is highly abrasion and puncture resistant.
I wouldn't use Carbon fiber in a rudder, since the carbon fiber can cause galvanic issues with metal hardware, which the fiberglass and kevlar will not.
Hope that helps.
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You know what the first rule of sailing is? ...Love. You can learn all the math in the 'verse, but you take
a boat to the sea you don't love, she'll shake you off just as sure as the turning of the worlds. Love keeps
her going when she oughta fall down, tells you she's hurting 'fore she keens. Makes her a home.
—Cpt. Mal Reynolds, Serenity (edited)
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