the edge is 84: the cap is 85" but the cap has a dual tapper so its a tad less wing aera. the EF yak is 84 and its ultra light like 15lbs watch wing aera and weight a 120 engine is under 2 lbs or at 2 lbs a 50 is about 4lbs concider the battery and ignition as well as the motor a lb is a lot to an airplane.