Next message: Robert Gainer: "Re: [world-cruising] Re: Keel stepped mast or ????"
Robert Gainer wrote:
> I have been out of it for a bit, but I don't think they use the foam in the
> area of the step. It does not have enough strength in compression.
My specific knowledge of structural foam in sailboats is in current
Valiants. The foam is selected specifically for its compression strength.
They use structural foam in floor timbers, underneath the cabin sole. The
aluminum mast step is supported by these timbers. They're also used for
engine beds, supporting 5/8 aluminum channel upon which the engine mounts
are through-bolted. [Many builders use oak or plywood encased in a layer or
two of fiberglass. Then they attach the engine mounts with lag bolts into
these beds. That's a recipe for disaster IMO.]
I've spent some time in both the Valiant and Pacific Seacraft factories.
The differences in structural choices are remarkable.
There are, of course, many different types of structural foam available.
Some are far superior to plywood in compression strength, plus they're
impervious to water rot.
--
Best,
Bryan Genez (KB3HMZ)
"Capella" Valiant 40 #158
Annapolis, MD
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