1) Air car, a car powered by an air engine
2) The Air Car (also called "Space Craft") is a do-it-yourself hovercraft that can be built "in a weekend". It has been extensively advertised in the back of Boys' Life magazine.
There are 4 different Air Car models, the third design has been copied many times. The power source is the blower motor from a "cylinder" or "tank type" vacuum cleaner The "Typical Tank Type Vacuum"