Some light reading for you ;o)...

http://howto.killerhurtz.co.uk/pneumatics.htm

http://www.technobots.co.uk/Technica...g%20Robots.htm

http://www.teamdavinci.com/understanding_pneumatics.htm

http://www.fightingrobots.co.uk/foru...hp?f=111&t=542

http://www.robowars.org/forum/viewto...er=asc&start=0