Building a hovercraft might not have been on your priority list recently, but now you can make your own with full instructions. By using fluid dynamics you can calculate the size of the blower needed for the size and weight of the craft you build. Various sized hovercrafts can be made from using either a small vacuum cleaner engine which plugs in up to a 2 stoke weed whacker engine with a 24 inch propeller attached. Sounds like fun.
Plans available from Xinventions.