I only have a Peak 26cc engine on mine, which is lighter than yours. You also used two "C" 4.8V packs Where did you mount the batteries. If I remember the cg on mine was 7-8 inchs from the leading edge near the fuse, it was aft the wing tube if I remember correctly. I sense from other posts if the cg is on the wing tube all will be well, do you agree?
Thanks
ORIGINAL: gapple12
Mine was the same. I had the SPE 40cc gasser up front and two huge "C" size 4.8 batteries and it was still tail heavy according to the manual. The manual is wrong. When I first took off it flew dead straight and I was no were near the correct CG. I don’t have the correct CG setting but if you put everything up front, you’re real close. Hope this helps.