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you can make a very lovely hovercraft using a throw away CD. you would require an old
CD, some rubber glue, a balloon, a rubber band, an old sketch pen and a rubber disc.
remove the lid and the tip from an old sketch pen. remove the end cap and cartridge inside.
now with the needle make a hole in the cap of the sketch pen. this is the front view
and this is the back view. now take this cap in the rubber disc. push the cap slightly
inside.. now take an old computer CD and on the back side apply some rubber adhesive and
let it dry for some time. then take this rubber disc and stick it right in the middle. this
is the back view, you can see the hole in the middle. now take the sketch pen and attach
a balloon to it tightly with a rubber band. now this will be the assembly. you can insert
the pen like this, but the balloon is not inflated. inflate the balloon and put the
sketch pen back. now this air will escape from small orifice and the CD will swim on
the pushing of air. this is the principle on which a hovercraft works. place it on a
smooth surface and you can push it from the left to the right. if there is no air in the
balloon the hovercraft does not work. you can also place this CD hovercraft on the smooth
floor and give it a little push and it will go smoothly from one end to the other. this
is a great fun toy and also a very nice experiment.