Inventor and crazy man Colin Furze has built himself a dual-rotor hovercraft out of two gas engines and a couple of fans. It has no seat, no steering, and no brakes, but it flies! Why doesn’t it have those things? They couldn’t add an ounce more weight, or it wouldn’t have been able to take off. You can see his plans in this video and some of the early tests in this one. Do I have to add that you shouldn’t try this at home?