The Aerocar was developed in the era of space-age futurism, and looked the part. It looked slightly like the Jetsonsflying car, with a large bubble cockpit, tailfins, and disproportionately small wheels for a car. It was developed from the Rotocar III design which was based on the Sky-trac 3 helicopter. The helicopter used counter-rotating rotors. On ground propulsion to the wheels was through a hydrauliclinkage to the engine.