1" Ball Valve

Cannons powered by pneumatic pressure (compressed gas) using a valve or other release.
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LGM
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My first coaxial has been sitting in my garage unused for some time now because I have never been able to succesfully fire it. I know this is because I have not had a big enough port, and I was wondering if a 1" ball valve would be enough to port it.
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MrCrowley
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Dimensions Please?

-Chamber Diameter and length
-Barrel diameter and length
-Previous porting device
-Piston Weight(guesstimate)
-Air Pressure
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LGM
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barrel is 2"
chamber is 4" by about 3'
the two previous ports were a blowgun and a 1/4" ball valve (I had very limited knowledge at the time and my funding[dad] said that a ball valve was overkill)
the piston is less than a quarter pound, just a plastic disk.
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MrCrowley
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1" is over kill, 1/2" or 3/4" will be fine.
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ballad of NJ
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you ned better funding
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