Lew Hodgett wrote:

William R. Watt wrote:

The foam boatbuilding I've seen described requires a building frame
to which
a special boatbuilder's foam is attached.


That's one way, probably the easiest.

It's then covered on the outside
with lots of fibreglass for strength. Then it's femoved from the bulding
frame, turned over, and covered on the inside with more fibreglass. All
that fibreglass makes it heavy.


What absolute BULL ****.


Lew

Don't hold back, Lew.
As a data point on the weight of foam sandwich construction, my current
project is a 29' sailing trimaran built in core-cell foam, knitted glass
and epoxy. The main hull, with interior, tanks and some fancy cockpit
joinery weighs about 900 lbs.