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little help ?

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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little help ?

Unread postAuthor: noobyspud » Tue Aug 26, 2008 7:57 am

hey guys,

Just got my first air cannon up and running with a 1" by 5ft barrel with a 3" by 3.2ft air chamber with a ball valve. Very happy with it and fires very well. but unfortunately for some reason the cap of the chamber began to leak air and cannot be fixed :( . so i've decided to buy a new cap but cut down the chamber a bit ! but the question is how big sh0ould the chamber be ? i assume the chamber's volume should be the same sized volume as the barrels volume other wise it would be a waste of air ?

thanks guys
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Unread postAuthor: ALIHISGREAT » Tue Aug 26, 2008 8:29 am

i would just cut it down as little as possible... bigger is generally better... but you can't really go wrong with a 1/1 C/B ratio
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Unread postAuthor: jimmy101 » Tue Aug 26, 2008 9:43 am

1" by 5ft barrel with a 3" by 3.2ft air chamber

Your current CB ratio is about (3<sup>2</sup>)(38 )/(1<sup>2</sup>)(60) = 5.7:1
So the volume of you chamber is about 5.7 times greater than the volume of your barrel.

You can chop off a fair amount of the chamber without really affecting the performance. If you chopped off 1 foot of chamber the CB would still be 3.9.
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