- 1). Turn the cardboard so that the 5-inch side is facing you. Measure 1 ½ inches in from one end and draw a line with a pencil; make that line extend 1 ½ inches deep into the cardboard. Measure 2 inches in from your first mark and make another line.
- 2). Cut out the notch you just made. The result will be a 2-inch by 1 ½-inch cut in the cardboard. Dispose of the extra piece you just cut out; you will not need it.
- 3). Slide the skewer through the holes in the corrugated cardboard, so that it passes through the front edge of your notch. Shift the skewer so that it extends equally out both sides of the cardboard. Twist the skewer in both directions until it will turn freely, without any forcing.
- 4). Wrap a small piece of masking or duct tape around the center of the area of the skewer that crosses through the notch. The tape should wrap firmly around the skewer two to three times, leaving a small, tail sticking up to catch the rubber band. The catch must be thick enough to hold your rubber band; measure the band against the catch if necessary.
- 5). Slide one washer into the center hole of one compact disc. Slide the washer and CD onto the skewer, pushing only far enough to allow for the CD to sit on the skewer; leave plenty of room between the CD and the cardboard for better spinning and balance.
- 6). Bond the CD and washer to the skewer with poster putty. Push the adhesive putty tightly against both sides of the washer and CD to form a strong bond. Turn the CD; the CD and skewer should turn together like an axle. Add more poster putty if needed to tighten the bond.
- 7). Repeat steps five and six for the remaining washer and CD. Both wheels and the axle should turn together.
- 8). Tape a rubber band to the cardboard directly opposite the tape catch, on the other side of the cardboard. Make sure the rubber band will stretch between its taped location and the catch; the stretching is what will power your car.
- 9). Stretch the rubber band so that the unattached end slides over the catch. Turn the axle so that it stretches the rubber band; continue until the band is stretched to its fullest. Hold the axle in that position.
- 10
Place the car on a flat surface, rubber band side down. Release the wheels; the car will take off due to the potential energy stored in the rubber band. - 11
Make any modifications or add decorations as necessary.
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