I'd suggest using a structural foam that has some strength in
compression,like 5 lb. density Core-Cell, maybe 3/4" thick. Rip trapezoidal
strips, 3/4" wide (bulkhead thickness) on the top with 45 degree bevels.
Bond it to the hull with thickened epoxy. If you need to kerf it to get it
to bend to the hull, that's OK. Then, clean it up and glass your bulkhead
in with several tabbings of 1708 glass.



wrote in message
...
I am attaching plywood bulkheads to the hull of my boat to provide
support for fuel tanks on a Morgan OI41. Best info I have been able
to assemble says to put foam under the plywood before tabbing them to
hull. Question is: What sort of foam? Thickness of foam? Seems to
md that this application would require something denser than the
standard sheet foam available in home supply stores. Any suggestions?