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This Air Cannons was designed by David Vella from Australia. the summer of 1998.
These plans are reproduced here with his generous permition..
The Marble Gun will shoot 10 or more marbles <depending on the
magazine size> in rapid succession and not push them all out
the barrel all at one time. The main factor in the guns
operation it the fact that the air chamber volume must be many
times the volume of the barrel. I believe that this gun has a
manual hand operated valve, but a solenoid valve could be used.
To load the gun . Uncap the magazine, wrap just enough tissue paper around the first marble to keep it from rolling out the barrel and then fill the magazine.replace the cap...and fire.
Better plans and building details to follow soon.