Built a Royal kit with a scale interior, on-board glow driver, main and tail wheel retracts and a Saito .91, it's covered in Century 21 fabric and it came in at 10lbs. 4 oz. (yes, I did replace lots of the kit's wood and used lighter sheeting in place of the heavy 'planking' shown on the plan). While it requires a good pilot with experience on heavy scale ships, it flies great at that weight with plenty of speed and reserve power, but really needs the use of the flaps and holding airspeed on approach. Those thin wings will surprise you if you slow down too much, too close to the ground.