Here is the diagram explaining how the hovercraft worked before we tried it out. That's me at the board! Our hovercraft was made using a CD, bottlecap, and a balloon. It's fairly easy to make (I made ours at home before camp just to ensure it worked- you should have seen how excited I was to try it out ;)
How to make the Hovercraft:
1. Glue a bottlecap on the middle of CD and then put a hole (small) in the bottlecap (I used a nail to do this)
2. Blow up a balloon and put it over the bottlecap and release it on the table/floor
3. Push it gently around!
BEWARE: Your kids may request this millions of times!
It really resembles what an air hockey table feels like. The kids think it's the coolest thing ever!
This would be a great lesson for elementary age students relating to physics, forces, or motion, plus it's so much fun (seriously and I'm not a kid). If not for learning purposes- IT IS STILL FUN!
Hope you get a chance to try this! Let me know if you have any questions!