A 1/8" plate of copper that is 2" x 24" isn't all that heavy..

You could install two of them and probably never have to replace them again. Have them installed with five 1/4" x 20 copper studs attached...and you'd be good to go. However, how you get from the mast, to the underwater part of the boat on a catamaran without encouraging sideflashes is a neat trick.
A trimaran is a bit simpler... and I'm planning on getting a strip made up for my boat.
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Sailingdog
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Telstar 28
New England
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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