[sparks-1784]

A team used a pneumatic 'gun' in competition in 2008. That competition required moving something similar to a medicine ball. I don't remember the team number, but they rigged a parallel arrangement of small pneumatic cylinders (and mechanically connected in series) and used valve timing to accelerate the medicine ball. The cylinders were small to obtain higher speeds from the available flow rate. Pretty interesting design.

I would expect that something like this would work for a kicker without any mechanical advantage (read lever arm).