This instructable coves how to build a hovercraft out of a foam tray, cardboard, and some other household items.
Step 1: Materials
For this project you need:
A foam meat tray (smaller is better)
Some non-corrugated cardboard (I used the kind in Kudos bar boxes)
A small 1.5 volt DC motor
A propeller that can attatch to the motor (I used one from an old RadioShack kit)
A nine volt battery
A nine volt battery snap
A glue gun
A craft knife
Step 2: Make the Intake
The intake should be as short as possible to allow very little air to escape. Measure the length from the bottom of the motor to the end of the propeller blade, then add a half a centimeter or so. The top should be just wide enough to fit the motor on it without too much overhang. The angle of the back isn't crucial, but I have found 45˚ works the best. Once you have figured out the measurements and cut it out of cardboard, glue it all together with liberal amounts of hot glue.
Step 3: Make the Base
The base is just a foam meat tray with a hole in it. Trace the outline of your intake in the center of the meat tray, then cut it out with the craft knife. Be careful not to dent the bottom edge of the tray, as it could cause it to go off balance and touch the ground.
Step 4: Attatch the Intake to the Base
Now hot glue the intake to the foam tray, directly over the hole, with the meat tray facing down.
Step 5: Attatch Motor and Battery
Use the tape to attatch the motor to the top of the intake, and more tape to attatch the battery to the back, just past the intake. Make sure to leave enough room for the fan blade to move. Then attatch the battery snap to the battery.