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c:b ratio question

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 question

Unread postAuthor: Pilgor » Wed Feb 20, 2008 8:17 pm

I did the calculations, I'm not sure if they are right, math is NOT my subject. I want to make sure my rations are right before I build my gun.

I'm using a 2.5" barrel that is 60" long
I'm using a 4" barrel that is 42" long

I got 1.7:1 as an answer. Is it correct? and is this good ratio for a pneumatic. please do not rag on me saying use search, I did. I'm no good at math.

Thank you
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Unread postAuthor: Fnord » Wed Feb 20, 2008 8:34 pm

I'm using a 2.5" barrel that is 60" long
I'm using a 4" barrel that is 42" long


Your current ratio is 0:Infinity.
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Re: c:b ratio question

Unread postAuthor: starman » Wed Feb 20, 2008 8:55 pm

Pilgor wrote:I'm using a 2.5" barrel that is 60" long
I'm using a 4" barrel that is 42" long

I got 1.7:1 as an answer. Is it correct? and is this good ratio for a pneumatic. please do not rag on me saying use search, I did. I'm no good at math.

Thank you


Did you mean to use the 4" as the air tank? If so you are closer to 1.8/1, actually 1.792/1.
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Last edited by starman on Wed Feb 20, 2008 9:10 pm, edited 1 time in total.
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Unread postAuthor: bigbob12345 » Wed Feb 20, 2008 9:04 pm

do you mean the 4in is your air tank if so then
it is 1.872 so you were pretty close.


Edit beaten by Spitfire
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Unread postAuthor: starman » Wed Feb 20, 2008 9:18 pm

bigbob12345 wrote:do you mean the 4in is your air tank if so then
it is 1.872 so you were pretty close.


Uhhh Bigbob, did you round off some numbers? Using the full floating point capability of the Windows Calculator and deeply accurate pi, I came up with 1.792, significantly different than your number.
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