This scale model of an EC-135 ADAC Notarzt Christoph 33 helicopter is so ridiculously huge that it might as well be the real thing. It weighs in at about 108 pounds, has an 11.5 foot rotor diameter, and gets its lift from a turbine engine. Skip to 3:45 to watch it take off.
Joby Aviation’s two-seat fixed-wing flyer has 12 propellers to help it take off and land like a helicopter, but can stow eight of them and flip the other four to turn it into a conventional airplane while cruising. It uses electric motors to fly at speeds up to 200 mph.