I just made this cannon the other day. its much more compact from the rest of the cannons. There are three major improvements. It has a removable barrel that is an inch in diameter, an electric valve with an electric switch, and it has a pressure gage to get a more accurate pressure reading.
parts list
one electric sprinkler valve 1"
8-10' of 1 " PVC
2-6' of 1 1/2 " PVC
two 1" three way PVC parts that are threaded in center joint
two 1" male threaded connecter
two 1 1/2 " end caps
one 1" end cap
9 volt snap
one 1 1/2" X 1" X 1 1/2" three way
trigger/ switch
pics
http://www.makezine.com/blog/archive/2006/06/henrys_air_cannons.html
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