I am building a foam delta and I am looking for the proper cg range. The delta is 37 inches from nose to rear and it has a 72 inch span. I have no way of posting a pic.
Thanks,
Chris

Try this:

http://www.lferc.org/tips/mean_aerodynamic_chord.htm

If your plane is similar to a Zagi, you could scale up the CG location from that plane.

Tom