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NOTE:12-26-98 Changes that should be made in the drawing. The 1" (red) "T" should be a 1 1/2" "T" with a 1 1/2" X 1" adapter in each end. The 1" pipe and 1" X1 1/2" Bushing Adapter should be removed and the barrel extended all the way into the "T". the 3" X 1" bushing that the barrel passes through should be a 3" X 1 1/2" bushing.
This is my idea of and improvement to the "sprinkler
valve" pneumatic cannon or spud gun. It is my thinking that
there is a "bottle neck" of air flow at the valve.
Think about this. You build an air cannon with a 3" air
chamber and a 2" or 1 1/2" barrel that is fed air
THROUGH a 1" valve. Now this gun gives good performance and
your happy with with it. But, if you built a pneumatic gun it is
for one reason......MORE POWER !
So why not use 2 valves to double the air flow.
Now this might not give you 2 times the distance but it will
surely increase your range. You see the air pressure pushing the
spud is not what gives it it's speed .(well it is part of it )
but the real factor here is the VOLUME of air pressure along with
the speed at which it is being delivered or moving.
I drew this gun up with the barrel inside the air chamber
,because I am kinda fond of this design. This same idea of 2
valves can easily be adapted to the "over and under"
design of the barrel over the air chamber. the basic wiring of
the batteries and triggers (not shown)for this gun can be found
on my Wiring Diagram page.
If you can't figure out how to construct this gun and wire it
up,from the information found on these pages, you should not try
to make it.
This gun should be safe if not pressurized to more than 100
psi. even if you are tempted to do so , do not . 100psi will give
you a safety factor of 2 1/2 before the pipe will burst If the
air chamber were to crack because of over-pressurization it would
not stop there. The gun would literally EXPLODE into many very
sharp pieces of shrapnel that will not only cut you and sink very
deeply into your body it might very well kill you and anyone
unlucky enough to be to close in the process.
This Air Cannon was designed by me on or around 3-1-1998.