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C:B ratio

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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C:B ratio

Unread postAuthor: super spuder » Mon Apr 23, 2007 3:55 pm

i am about half way done a small marble gun. it has an extremely small fire extingisher for the chamber (i have not figured the volume yet) and i am going to go and get the barrel tomorrow i think, but i was wondering what is a good C:B ratio on a small marble cannon would be. i was thinking about 1:1 but i am not sure.
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Unread postAuthor: ShowNoMercy » Mon Apr 23, 2007 3:58 pm

How can you be a Master Sergeant and not know of the gas gun design program? Just plug in your wanted muzzle velocity and then build you barrel off of that information.
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Unread postAuthor: super spuder » Mon Apr 23, 2007 4:38 pm

well sorry. but i have never built a marble fun before. and where do you find this gass gun design thing
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Unread postAuthor: iPaintball » Mon Apr 23, 2007 4:46 pm

I wish I could use the ggdt. I have a iMac now, so I can't download it! :cry:
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Unread postAuthor: hi » Mon Apr 23, 2007 5:09 pm

on a pneumatic (if you have around 130 psi) you can easily get away with a 1:4 C:B. the only problem with that is that it would always have to be fired at a high pressure. which isnt a problem if you always have a compressor, but if you only have a bike pump then you would need more like a 1:2 ratio.
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Unread postAuthor: super spuder » Mon Apr 23, 2007 6:00 pm

ok thanks. i think i might go for about a 1:2.5 ratio
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