We set out to see if we could make a vehicle that would be powered by the air rushing out of a balloon. This is similar in principle to the force that sends a rocket in to space or a jet plane flying forwards. We had to experiment with lots of different wheel sizes, axle designs and tube diameters to see what gave the best results. After numerous attempts and various adaptations, we all settled on our favoured designs. Then, it was time to race. The results were impressive!