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3" coaxial

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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3" coaxial

Unread postAuthor: xboxteen01 » Sun Feb 10, 2008 2:31 pm

Im thinking of making a 3" coaxial, approx 3 feet long with 1.5" barrel. From the research ive done, i plan on having it be a barrel sealing piston/diaphragm, exhausted by a 1 inch modded sprinkler valve. My question about this is if i have the specifications listed, will i be loosing power/wasting it. or am i robbing myself of power?
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Unread postAuthor: thespeedycicada » Sun Feb 10, 2008 2:35 pm

sounds fine longer barrel couldn't hurt though...
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Unread postAuthor: xboxteen01 » Sun Feb 10, 2008 2:55 pm

what if i increased the barrel length to 4 ft, would i have to adjust the chamber?
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Unread postAuthor: bigbob12345 » Sun Feb 10, 2008 3:09 pm

No you would not need to ajust the chamber the longer the barrel the more power until the ratio gets around 0.2:1 at 100psi.
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Unread postAuthor: psycix » Sun Feb 10, 2008 3:18 pm

You rchamber is kinda large compared to your barrel.
You should do atleast a 4, 5 or more feet long barrel.
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