This aired recently on an episode of Future Weapons: developed by Rafael and Lockheed Martin. Of course, this is motor driven, but it has a special appeal to me.
A high-speed, stealthy and futuristic shaped boat appeared through the twilight, as if taken out of a science fiction scene. It sliced the water quickly and gracefully, closing-in on the target vessel with extreme agility. A gun barrel at the bow, kept its aim steady on the same point of the target vessel, in spite of the boat's movement through the water and the swell of the sea, as if it was firmly connected with invisible wire. A close look would reveal a somewhat surrealistic picture, as no personnel is seen onboard the fast maneuvering boat. Where is the crew that operates this highly-capable patrol boat?
No, it's not science fiction. It is Rafael's 'Protector', an unmanned integrated naval combat system, based on unmanned surface vehicles (USV). Highly autonomous and remotely controlled, Protector is able to conduct a wide spectrum of critical missions, while eliminating unnecessary risk to personnel and capital assets.
Note that you can find video available here.