Hovercraft at Home
The hovercraftâs ability to fly over land, water, ice and snow make them not only suitable for military purposes and James Bond Movies, but also for search and rescue teams. While today theyâre not the âeverydayâ family mode of transportation Sci-Fi writers of the 1950âs and 60â s dreamed, that doesn't mean its not possible.
Will your little scientist or engineer be responsible for the technological advances required to place a hovercraft (green powered of course) in every town for emergencies, or in every driveway of the future?
Concepts:
Engineering
Air
Friction
Aerodynamics
Supplies Youâll Need:
Discarded CD-Rom
Strong glue â glue gun (adult helper), Gorilla Glue Âź or Epoxy
9-11 inch balloons
Pop-Top lid from a water bottle
Optional : Plastic lids, cardboard from a cereal box
How to Create It:
Make sure the CD and the pop-top are completely dry.
Use your chosen method of gluing to attach the top to the center of the CD.  Make sure the center hole is free from glue and that there is a tight seal around the edges.Once the glue has dried, push the pop top down to close.
Inflate the balloon and twist the end â do NOT tie.
Keeping the end twisted , place the mouth opening over the top of the pop-top lid. When you release, the balloon should untwist and still hold air.
Pull the pop-top up and the air from the balloon should cause the CD to elevate ever so slightly on the surface.
How it Works:
The slow-moving air from the balloon is released downward against the surface below the hovercraft (CD). The air currents create an air cushion on the smooth surface. The cushion reduces the friction between the two surfaces, allowing the the CD to glide freely on the surface below.
Further exploration:
Try different surfaces...is there a change? Ask your kids what other items they would use instead of a CD such as cardboard cereal box, oatmeal or coffee can lids with circles. Maybe even an old LP. Have them try and fail for the sake of learning. And donât forget to have them record their findings like professional scientists.
Notes:
An 11 inch balloon is a little floppy, but a 5 inch balloon doesnât hold enough air.  A 9 or 10 inch balloon might be best.
I used a hot glue gun. Â If you choose to use the same, Â please make sure to supervise a younger child appropriately.Â












