Basin - again try to imagine a 72" aerobatic plane with 15 oz wing loading trying to fly IMAC pattern. It will be too floaty to fly. Guess, the wing loading has to be at the optimum for its purpose. If its 3D then a 17oz to 20 oz wing loading for a 72" would be very nice. I tried some really light 40 sized planes for non 3D flying and did not like it ... Ok ok ... I admit ... I cannot 3D!!! Hehehe ...