Mike 456 i just madiened my composite T-45 the c/g i used was 143-145 mm from the inlet lips back that distance....it flew great couple clicks of right roll and some down trim was needed. any body having ROG issues? mine needed 250 300 ft to get air born...mines heavy with retracts and a pq 4350 batt. 4.5 lbs i was at 2300asl with air temp at 75 degrees.