Balloon Car Project.?

For our science class, as a final project, the teachers assigned us to make a balloon car. We are limited to one balloon for each car and each car must have 3 wheels. I created a design I used a long time ago in grade school to get me first, but now it doesn't seem as efficient compared to others. I used a... show more For our science class, as a final project, the teachers assigned us to make a balloon car. We are limited to one balloon for each car and each car must have 3 wheels. I created a design I used a long time ago in grade school to get me first, but now it doesn't seem as efficient compared to others. I used a styrofoam chassis and bamboo skewers as axles. For the wheel, I used CD's coated with rubber with a bottle cap in the middle for the skewer to stick through. Any ideas to help improve my design? or compeltely different ideas? Any help would be greatly appreciated. I really need this high mark to boost my grade. Thanks in advance!
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