Things You'll Need:
- Balsa wood sheet
- Two drinking straws
- 4 plastic bottle caps
- Kebab skewer (smaller diameter than straws)
- Masking tape
- Hot glue gun
- Balloon
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Step 1
Cut one straw into two portions, 2 inches long each, and the skewers into one 6-inch portion each, and discard the remainder.
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Step 2
Cut a piece of balsa wood, 4 inches by 6 inches.
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Step 3
Glue the two cut pieces of drinking straw to the top of the balsa wood, about 1/2-inch in from each 4-inch side of the wood, running parallel to the 4-inch side.
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Step 4
Glue a bottle cap to one end of each skewer, positioning the skewer so that it is in the center of the cap, so that it will rotate evenly.
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Step 5
Apply a ring of hot glue around the straws about 1/2-inch in from the bottle cap. Each ring is applied individually. Do not glue the straws together.
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Step 6
Pass the skewers through the straw portions, and repeat Steps 4 and 5 with the remaining bottle caps so that all four wheels are attached.
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Step 7
Insert the uncut drinking straw into the balloon and secure it by wrapping around the neck of the balloon tightly with masking tape.
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Step 8
Tape the balloon to the top of the sheet of balsa wood, with the straw facing off one of the 4-inch sides.
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Step 9
Blow into the straw to inflate the balloon, and release to let the car go. It will drive in the direction opposite the direction the straw is pointing.
