Hi Jim, I think you are talking about the 84 inch gaint stinger. I am flying one with a G62 and B&B smoke. My CG is 6 inchs back from the leading edge and it flys real good there. I would say that the CG runs from 5 1/2 to maybe 6 1/2 from the leading edge. At 6 1/2 back might be a handful to fly. I have not tryed it. At 6 inchs it will fly inverted with less than 1/8 inch of down elevator. Hope this helps you.Wayne M