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My bolt action project

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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My bolt action project

Unread postAuthor: dudeman508 » Thu Feb 05, 2009 10:16 pm

I am planing on making a bolt action similar to this onehttp://www.spudfiles.com/forums/deus-ex-machina-how-to-t8418.html And i also wanted to be abel to keep firing on one fill. My Cb ratio in going to be 1:1 and my barrel will be 2 feet and 5 inches of 1/2in. pipe, i am going to have a check valve in between the main chamber and the mini chamber. I also am limited to about 140psi. How big would i need my main chamber to be to get 5 shots, filling the mini chamber to 80psi. You also have to consider that the firs shot will already be filled, since the check valve will open as i fill the main chamber.
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Unread postAuthor: jon_89 » Thu Feb 05, 2009 10:18 pm

I asked a similar question awhile ago. I will have to find it.
Edit: This may help.http://www.spudfiles.com/forums/air-tank-supply-t15739.html
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Unread postAuthor: dudeman508 » Thu Feb 05, 2009 10:26 pm

(volume of tank*tank pressure)/(volume of chamber*chamber pressure)

so if i did that the number would be the number of shots i could get at 80psi. Sorry i have to ask i don't really understand the formulas on the thread to well, Im only 12 lol.

Edit: i did that math and it said i would get six shots wich is enough for me, but i still dont even know if i am doing the math right.
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Last edited by dudeman508 on Thu Feb 05, 2009 10:30 pm, edited 1 time in total.
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Unread postAuthor: jon_89 » Thu Feb 05, 2009 10:28 pm

How big will your firing chamber be?
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Unread postAuthor: Ragnarok » Thu Feb 05, 2009 10:33 pm

dudeman508 wrote:so if i did that the number would be the number of shots i could get at 80psi


No. What you need is this:

# of shots = (Volume<sub>tank</sub>*(Pressure<sub>tank</sub>-Pressure<sub>chamber</sub>)) / (Volume<sub>chamber</sub>*Pressure<sub>chamber</sub>)

The chamber pressure needs to be considered when it's such a large proportion of the tank pressure.
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Does that thing kinda look like a big cat to you?
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Unread postAuthor: jon_89 » Thu Feb 05, 2009 10:34 pm

So I gave the wrong material? :oops:
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Unread postAuthor: dudeman508 » Thu Feb 05, 2009 10:39 pm

@jon_89 - Probably not, I think i just looked for the simplest formula to understand.

@Ragnarok- Thanks that will help

Edit: i was just thinking about this today, If i used a sprinkler valve would i have to factor in the air wasted closing the valve.
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