Richard Riley
:

On 25 Mar 2005 09:07:19 GMT, Fortunat1 wrote:

:Bryan Martin
:sednews:BE693745.3CE41%bryanmmartinNOSPAM@comcas t.net:
:
: You probably won't save any weight with a fiberglass tank. Homemade
: fiberglass lay-ups tend to be a lot heavier than aluminum for the
: equivalent strength. The big advantage of fiberglass isn't weight,
: it's the ability to easily form it into complex shapes.
:
:OK, thanks. I wasn't actually thinking of a layup, but a foam core
:construction made of foam sheet coverd in two layers of glass cloth
:each side amd made up into box. Looks like it should be light enough,
:but I can't tell how much epoxy i'm going ot need. The tank would be
:about 23 Sq feet in surface area, one side, of course, si double it
:and add a bit for baffles and I need to glass and epoxy about 50 sq.
:feet of 1/4 inch foam. any notion how much epoxy is needed? I've only
:ever done little patching jobs with epoxy

Figure, as a rule of thumb, the epoxy will weight 50-60% of the glass.
But for a tank, that fraction goes up, since you want the inside
laminate very wet and no leaking dry spots.

Aluminum will be lighter.


OK, thank you very much..

Sold.