On Feb 18, 1:33 pm, "Maxwell" wrote:

Given the same core thickness and cloth weave, won't he gain a little
stiffness on a panel this thin with fiberglass as well?

On paper, yes. Kevlar (aramid) is not a particularly stiff fiber. In
the lineup between glass, carbon & Kevlar, the Kevlar comes in last in
terms of stiffness. Actually it comes in last for just about
everything except impact tolerance/cut resistance/abrasion resistance--
at which it is superb and of course is mostly what it is used for.

In use in a panel you would have to get out the good tools to measure
the difference in deflection between any of them. As long as the face
sheets are bonded nicely and you've got a decent core material, almost
any laminate panel is honkin' stiff.