There are two different types of remote control aircraft. There are those made by hobby fliers just for the fun of it. And then there are multi-million dollar remotely piloted aircraft developed by huge aerospace companies. The Boeing X-48B, quite obviously, falls into the latter category. The X-48B has a 6.4 meter (21 foot) wingspan, and weighs in at 230 kgs (500 lbs). Power comes from three turbojet engines mounted at the rear of the aircraft. It can fly at up to 136 mph (220 km/h), and reach an altitude of 3,000 meters (10,000 feet). Like I said, this isn't your everyday RC plane.