I have the 90 with a G-38, I moved the fuel tank back about 3 inches and used the receiver and batteries for balance. I have a 5 pack of sub-C's about 1/3 rd between the tail and cabin area. Balances right on. The G-38 requires about a 3 ft. rollout and must be on low idle to land. I am using an 18x8 prop. A high quality kit (arf), much better than most arf's out there. I would buy their kits again.