Science Olympiad, right!?
I did that last year. Mine had four motors, two for driving and sering, one for the arm, the other for the claw, to pop the balloons, we had the "star-o-death." It was a bunch of exacto knife blades glued together. I'll post some pictures if I can find them.
Hey, don't worry. Some teams went there with a "zip-zap" car with a cup. :-)