Let's see, if a yard of both weigh the same, and have nearly the same thickness, then could one conclude that the specific gravity of each type of material is nearly the same? Sounds like it to me, but some research shows a specific gravity range for carbon fiber of 1.3 - 1.8 and for glass fiber of 2.5 - 2.6. That's about what I expected based on my experience with these two fabrics. This strongly suggests that for two samples of equall weight but of unequall material density, one must be thicker than the other to make up for the lack of density. Is there some other variable I have missed?

Ted

: The popular twill weave is definitly a little thicker but the plain weave CF
: isn't significantly so.

: 5.7 oz. Twill weave CF is .010 thick
: 5.5 oz. Harness Satin is .009 thick
: 6.0 oz. plain weave E-Glass is .0093 thick
: 6.0 oz. plain weave S-Glass is .0089 thick
: (data taken from US Composites site)

: So by doing the math we wind up with .1008 Cubic inches more epoxy per square
: foot. Unless you are doing the whole boat that is pretty insignificant.

: Most people are only using the CF to reduce the layering you would need when
: using regular glass so you are reducing the amount of epoxy used and
: saving weight while adding strength.

: The real problem I had using the carbon was that you can't tell when it is
: wet out so you keep dumping more epoxy one it. Mine never went clear!

: --KT--