I have just finished construction of a Goldberg Extra 300. I have a Saito 100 engine, fiberglass Specialties cowl and landing gear, 3" tru-turn spinner and APC 15 x 6 prop. I have put two servos for the elevator in the tale. Checked the balance last night and it is 5 1/2 " from the leading edge. I have not weighted the plane yet or covered it, but it seems to be light.