Chris,
I mentioned this project to a fellow builder, some time ago. I
suggested he
follow your lead with Carbon fiber wing skins.
I mention this for my own education/understanding benefit, as I'm sure
you
know what your doing.
My friend said that he wouldn't use Carbon on the wings as it is too
stiff
and would not allow the wing load to be taken up completely by the
spar -
until the skin failed.
Always willing to learn!
What's your opinion on this !?
George (down under)

The wing skins are all 45 deg. plys, where the spar is all
unidirectional carbon tow.
There's not enough stiffness in the skins to preclude the spars from
taking all the load.
Skins resist twist.  If the spar caps were made from glass, then we'd
have a problem.

Incidentally, we're using an 18% section for the wing (max wing
thickness is 18% of chord at
any given point) which helps with wing stiffness.

Chris
microcosman.com

 
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