- Drink bottle lid (we used water bottle lids)
A hovercraft works by forcing air out beneath it, creating a cushion of air to float on. Hovercrafts usually have a “skirt” that surrounds the base to contain the air; in this project the CD is light enough that it doesn’t need a large cushion, so no skirt is necessary.
The balloon acts as a pressurised gas chamber. When you open the cap, the balloon forces air out through the cap, creating a thin cushion of air beneath the CD.
An air hockey board works using the same principles as the CD hovercraft. A fan under the air hockey table pushes air through tiny holes on the table’s surface. The flowing air decreases the friction between the hockey puck and the table, allowing the puck to move quickly and freely and allowing you to score!
Original article and pictures take http://www.muminthemadhouse.com/2015/08/14/balloon-hovercraft/ site