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Greg,
The strength to weight ratios of E-glass and intermediate modulus carbon
in similar epoxy laminate are surprisingly similar. However the carbon
laminate will be about twice as stiff. I would guess the main effect would
be to raise the flutter speed but I couldn't tell you how much. (Do they
publish a different Vne?) As I've never heard a comment on global stiffness
in conjunction with plastic airplanes, I assume you wouldn't be able to
tell the difference in flight. (Doubling the stiffness at the same weight
only increases structural frequencies 40%, not usually a noticeable
difference.)

Guy Buchanan Buchanan & Newcomer

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