Hello Kai

 

For efficiency, a "hat section" beam like you are talking about is best done with a uni cap and then a biaxial weave over the top.  Since stiffness increases by the cube of the thickness from the neutral axis, a slight increase in the height of the foam stiffener will make a HUGE difference in stiffness.  Carbon uni even in the most basic material (33 million modulus) is 3 times more resistant to stretch than E glass.  I also have "S" glass uni and Kevlar uni plus Kevlar/carbon hybrid weave, some standard weave and 5 harness satin weave, etc.

 

If you need some carbon uni, I have some in 4.75 oz/sq. yd, 9.0 and several other denominations.  Mostly it is 33 million modulus carbon and also mostly in 12" width but I do have some 1" tape uni and some 24".  I also have some Hercules IM-6 uni at 45 million modulus and about 650 ksi tensile if I remember correctly so it is roughly 30" stronger and stiffer.  Also, it is better to use a higher grade of epoxy than Jeffco or WEST system.  You may have heard my preaching about toughened epoxies but they are a lot better for advanced composites in just about every way.  Applied Poleramic is my source, they are in Benicia, California.

 

Send me an email if you are intersted in some uni and let me know how much.

 

Dan Newland