[Matt H.]

In 2008 several teams (including 1726) used Pneumatic Launchers. Because the valves restrict flow rate every successful pneumatic launcher (that I can remember) used some kind of trick.

1726 used a system where the cylinders where never completely collapsed. Levers were arrange to make the launch mechanism provide very little force for the first few second allowing enough air to fill the cylinder such that when the ball passed a certain point it launched very quickly.

Team 39 used a much simpler system where three valves fed into one pneumatic cylinder. They also used levers for speed. I find this method most appealing.

Remember that with all pneumatic mechanisms safety should be paramount.