Join Date: Mar 2006
Location: New England
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I thought a foam core would be lighter than ply, but thanks for the suggestion.
In larger sizes, yes, but the smallest boats are often lighter in stitch-and-glue than in GRP. A stitch-and-glue boat doesn't even need to have a full coat of fiberglass on it, where the skins on the foam-cored GRP boat have to have a minimum thickness to guarantee the core's integrity and provide sufficient stiffness to the design. Marine plywood, even 1/8" is pretty stiff torsionally, unlike foam, once it is bent and held in that position.
For instance, the Chesapeake Light Craft's Eastport Pram is 7' 9" x 48" and only weighs 62 lbs. One 8' GRP/Foam dinghy that I found on the net weighed in at 130 lbs... People often underestimate how much epoxy or vinylester resin and fiberglass cloth actually weigh.
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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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Still—DON'T READ THAT POST AGAIN.
Last edited by sailingdog; 02-15-2011 at 03:46 PM.