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This cannon in its configuration allows for inter-changeable barrels and chambers with a manually actuated sprinkler valve.
I started this project when a friend of mine put a Shrader valve on a large rectangular assembly of glued PVC, or what he called an air cannon. He used a ball valve and a one inch SCH 40 barrel. We would pressurize the cannon to 100ish psi, and launch anything we could find including rocks, dirt, water balloons, mops, 7/8" oak dowels, and c cell batteries. This prompted me to build a bigger, better, bad-asser cannon.
-3x18" SCH 40 or 2x36" SCH 40 chambers
-barrels interchangable from 1/2 to 3"
-1/4" NPT quick disconnect to compressor
-1/8" NPT tapped Schrader valve
-over-under design for user balance and storage
SINGLE vs. DOUBLE CHAMBERS::
With an air compressor, charging a dual chambered cannon is nothing taking a second or two longer than a single and about 5ish seconds total to charge. With the 3x18" tanks on the dually, I am pushing the sprinkler valves abilities for max volume, although the reward is somewhat interesting. I have found with a single valve, dual tank design, the air seems to create a vortex or a double sided stream, which will carry any ammo out of the barrel almost as if it made a perfect seal.
If you have a choice between single and double and you have an air compressor or large filling device, don\'t hesitate and get a double; however we are assuming you are pegging the other dorms with water balloons. What if you go paintballing with a friend and need something light and small to fill with CO2? Then a single chambered cannon is best. If you have 120 VAC and a compressor, the power output is wonderful and amusing.
.............the video was taken in 2005 for tests; it shows a wooden dowel being fired at 20 psi, from a single chamber design with a 1"x2 foot barrel. The dowel went 153 yards on that shot, using a small 12volt compressor