[KGood]

Depends on what mechanism you're using...keep in mind pneumatics will take a lot more space, add more weight, and as well have potential for many more problems than a motor...but it also has more capability of storing potential energy if you release the air explosively.

Either way, try to maximize power, initial tests with the soccer ball have shown than they can be a bit tricky to move a long distance; they're a lot denser than the orbit balls we had last year.