Foam Core question..

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Foam Core question..

Post by TW28RJ » Mon Aug 10, 2009 3:22 pm

I'm sure that the answer is obvious, but it's not imeadiately obvous to me. Anyhow, why do we need to remove the foam core in the keel area etc. when building in foam sandwich, but when using plywood as a core we leave it in?

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Re: Foam Core question..

Post by jacquesmm » Mon Aug 10, 2009 4:29 pm

Because the keel will work in compression if the boat runs aground.
Hull foam core has less compression strength than plywood.
Same for all places where you bolt something on: the bolts will compress the core. That's OK with plywood but not with foam.
An alternative is to use high density foam inserts where you bolt things on, Renicell is such a foam but for the keel, it makes sense to goo for heavy single skin fiberglass.
Jacques Mertens - Designer

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