I got this heli on a trade with everything but the electronics. The only problem is nobody seems to know what it is. The person I got it from told me it was a concept but it doesn't match up to anything. It came with an O.S. Max SX-H and JR PROPO exhaust. The rotor diameter is 49.5" and is 42" long. It has slots for 5 servos and has a shaft driven tail rotor.