The google car is an exception where there is a lot of sophisticated software. UAV's like Boeing's and even the ones you buy online (with the open source software) are running on boards, not full-scale PC's with the ability to play a DVD.
UAVs are very complicated in terms of technology and engineering, but the hardware is simple because it's basically just running control loops on some board.
UAVs are very complicated in terms of technology and engineering, but the hardware is simple because it's basically just running control loops on some board.