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how do I calculate the tank to barrle 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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how do I calculate the tank to barrle ratio?

Unread postAuthor: cork9 » Fri May 04, 2007 8:20 pm

I just orderd parts to make an over under air cannon. It is going to be a 3" air tank and a 2" barrle. I will have 5' lenghths of each. I want to know how to calculate the tank to barrle ratio so that i can decide how big im going to make it.
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Last edited by cork9 on Fri May 04, 2007 8:35 pm, edited 1 time in total.

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Unread postAuthor: rad14701 » Fri May 04, 2007 8:35 pm

Chamber Volume divided by Barrel Volume should be in the range of 2:1 to 4:1 for optimal performance... Volumes are calculated using the following formula...

Volume = ((Inside Diameter / 2)^2 * 3.1416) * Length
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Unread postAuthor: super spuder » Fri May 04, 2007 8:49 pm

barrel volume =754 ci
3:1 ratio = chamber volume of 251 ci
length of 3 inch pipe needed= 9 inches long :(

4:1 ratio= chamber length of 188 inches
length of 3 inch pipe needed=6.6

bottom line. you cant use the hole barrel :(
*edit* those are B:C ratios (barrel comes first) ensted of C:B
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Last edited by super spuder on Sat May 05, 2007 9:07 am, edited 2 times in total.
trying to decide on a new project, probably something small.
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Unread postAuthor: cork9 » Sat May 05, 2007 7:40 am

If i used a 3' * 3" tank and a 3' *2" that would be a 1.5:1 ratio right.
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Unread postAuthor: spanerman » Sat May 05, 2007 8:13 am

Sorry, i was under the impresion that C:B ratios were null and void on pneumatics....IMHO all the power comes from the flow/opening times of the valve :shock:
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Unread postAuthor: super spuder » Sat May 05, 2007 9:15 am

it does have some effect. 1017ci chamber
452 ci barrel
=C:B ratio of 2.25:1
oh by the way. just ignore my previus post. i mesed up big time
1696 chamber (whole pipe)
753 barrel volume (whole pipe)
= C:B ratio of 2.25:2
so just use both whole pipes
by the way, sorry about the erlier post, i was tired :wink:
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Unread postAuthor: cork9 » Sat May 05, 2007 9:37 am

so if i use the same lengh of 2" and 3" pipes it would be like 2:1
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Unread postAuthor: dewey-1 » Sat May 05, 2007 9:40 am

--
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Last edited by dewey-1 on Sun Apr 20, 2008 4:00 pm, edited 1 time in total.
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Unread postAuthor: super spuder » Sat May 05, 2007 1:21 pm

yea, i messed up, it was almose 11 so i was getting tired
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