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GGDT figures confusing me on my pneumatic cannon

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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GGDT figures confusing me on my pneumatic cannon

Unread postAuthor: g4bandit » Mon Dec 20, 2010 12:15 am

I was messing around with some figures in spudfiles and the barrel effect length is confusing me. It seems that having a really long barrel is more effective. anyone know what the best barrel length is for a 1" pneumatically actuated sprinkler valve cannon?
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Unread postAuthor: Hotwired » Mon Dec 20, 2010 12:21 am

You're asking the wrong question.

What you should be looking for is a muzzle energy value or a maximum size of launcher.

Then you can build to get that.

Unless you use a high pressure low volume chamber you'll have to have a very long, highly inconvenient barrel before the projectile stops accelerating.

What is the norm is to instead use a practical length of barrel and increase pressure and/or volume to get the muzzle energy you want.
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