
10-30-2011
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Tartan 27' owner
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Join Date: Jan 2008
Location: NYC
Posts: 2,749
Rep Power: 5
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For starters, if I was in your position, I would not assume that I needed to buy a sheet of metal myself from a plate steel wholesaler. Many metal shops have plate metals in stock that they bought some time ago that could be used.
I'll also point out that steel (stainless or otherwise) is a fairly poor choice of material for an underwater application as even stainless steel will rust in the absence of air. I'm not a metal worker but perhaps an anodized aluminum sheet would be fine if covered in fiber glass.
Yes, you want your new center board to be close to or equal the weight of the old one. That does not mean you need to make up the weight by using 3/4" thick metal plate. I'd think that you could use a thinner metal, say 3/8" or 1/2" that you would surround with epoxy (or polyester) resin and glass sheet. This method would allow you to sand fair the outside and hide any imperfections in the cut sheet metal. The bottom of the center board could also be extended with FRP/GRP (fiberglass) construction as this is the spot that would likely hit the bottom when you run aground. This would also allow your piece of sheet metal to be slightly undersized as you would build it up with laminates - which could be done indoors over the winter.
I've never used this stuff (G10) but you might consider using it for the stock for your replacement center board. Not sure if the weight would be in the right neighborhood though.
G10 Fiberglass Board
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"The cure for anything is salt water~ sweat, tears, or the sea." ~Isak Denesen
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