gweedgwag i am going to start at the wing tube. but i think it will end up just behind the wing tube and if you want the inches it will be 6.27 inches back from leading edge next to fuselage.also mine weighs 7.7 lbs. and i did not use the heavy wheel collars i also used hs 81 servo for throttle and allof my servo weighed 6.75 oz. i keept it light on the assembly. i was hoping to get under 7 lbs. never happen. i will be taking of standard muffler tomorrow and replace it with one that will be 4oz. lighter. but thats as light as it will ever get. i sure hope it flys light. can't wait for weekend.