3" coaxial

Cannons powered by pneumatic pressure (compressed gas) using a valve or other release.
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xboxteen01
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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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thespeedycicada
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sounds fine longer barrel couldn't hurt though...
current projects: co-axial piston valve.Status DONE!
S.P.E.C.S update mk 1 construction begining in febuary all the maths for it are done plans are drawn up and parts are listed.
NEXT project:auto piston valve.
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xboxteen01
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what if i increased the barrel length to 4 ft, would i have to adjust the chamber?
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bigbob12345
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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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psycix
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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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