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Old 14-02-2011, 00:03   #46
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Tuskie,

I saw some of Grainger's figures on a Barefoot 45. Can be built in both. Basla was cheaper but quite a bit heavier than Balsa.

Foam core inbelow waterline does not worry me with a good infused job.

Dean does not like core below waterline in his range and the vessels are comparatively quite heavy.
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Old 14-02-2011, 03:24   #47
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Originally Posted by downunder View Post
Tuskie,

I saw some of Grainger's figures on a Barefoot 45. Can be built in both. Basla was cheaper but quite a bit heavier than Balsa.

Foam core inbelow waterline does not worry me with a good infused job.

Dean does not like core below waterline in his range and the vessels are comparatively quite heavy.
Would be interested to know the weight penalty of solid glass layup below waterline as compared to the same design with cored hull "shoes". How many extra kg? I wonder about how much a weight saving this would represent as a proportion of a finished, fitted and fully loaded cruising catamaran.

I'm with Dean on that one.
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Old 14-02-2011, 21:08   #48
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Don't know the number but I do know Nathan Stanton suggested a significant weight saving with a heavier fibre layup and infusion vs non infusing for his FF46 hull shoe by comparison with a non infused Lightwave 45 of some 30 percent.

I know I could pick up one end of a FF46 infused shoe that was released from mold.
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Old 14-02-2011, 21:19   #49
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Example of weight differences for some of cut panel parts on Grainger Barefoot 45.

lower hull side foam 51kg balsa 68kg - 33% diff in weight of core
upperside hull foam 106kg balsa 141kg - 33% diff

It doesn't mean foam vessel is 33% heavier. presuming resin, tapes etc the balsa core alone is 33% heavier than foam core for that particular vessel.
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