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Need some ideas

Post questions and info about pneumatic (compressed gas) powered cannons here. This includes discussion about valves, pipe types, compressors, alternate gas setups, and anything else relevant.
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Need some ideas

Unread postAuthor: vng21092 » Fri Feb 07, 2014 1:19 pm

I was a little bored and I figured I haven't built anything in a while so I whipped up a quick QEV build,
Now, I had this idea to switch out the schrader valve and instead put a quick disconnect there. It would be line fed through a tube connecting to a 2'' PVC air tank, maybe 2 or 4 feet long that would be placed inside a backpack or something. Now, if the barrel is 1/2'' x 2 feet (volume ~6.7 cubic inches), what would be the best chamber size? Would 1'' PVC x 6 inches be the most efficient since its a 1:1 ratio? I will be shooting 1/2'' marbles.
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Re: Need some ideas

Unread postAuthor: 1nxtmonster » Fri Feb 07, 2014 3:50 pm

I did a rev with 1/2 inch barrel x 3 feet long, and my firing chamber was about 10 cubic inches. It worked great for marbles and nail darts.
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Re: Need some ideas

Unread postAuthor: jackssmirkingrevenge » Sat Feb 08, 2014 8:15 am

vng21092 wrote:Would 1'' PVC x 6 inches be the most efficient since its a 1:1 ratio? I will be shooting 1/2'' marbles.

It depends on the pressure you are using, volume ratio alone is meaningless. At say 150 psi you would get decent performance.

You might want to consider getting a regulated paintball bottle if you want some good velocity coupled with a compact setup and a good number of shots.
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