A Real Gem
Vehicles that skim over rough seas and
rugged terrain on a cushion of air are called hovercraft, hydroskimmers
or ground-effects machines (GEM). You can build a model that will
show how these almost friction-free air supported vehicles work.
- A metal pie pan with a smooth bottom
- A spool
- A balloon
- Turn the pan over and punch a small hole in the center.
- Glue the spool to the
inside of the pan, centering it over the hole.
- Stretch the neck
of the balloon well down over the spool.
- Inflate the balloon by
blowing through the hole in the bottom of the pan.