Material:
1. Old CD or DVD
2. Plastic drink bottle top
3. Balloon
4. White glue
Instruction:
1. Glue the bottle top over the hole in the centre of the CD.
2. Inflate the balloon and twist the end to stop air escaping.
3. Stretch the end of the balloon over the plastic drink bottle top.
4. Place the CD on a flat surface and release the balloon, give the hovercraft a gentle push.
Explanation:
Escaping air from the balloon lifts the hovercraft slightly above the flat surface, allowing it to move with less friction.
