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Co2 all Metal Build

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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Co2 all Metal Build

Unread postAuthor: Caramanos2000 » Fri May 11, 2007 11:39 am

Okay, I am using several paintball tanks and a remote. The remote fits perfectly into a 1/2" NPT thread fitting. So this is the setup: Paintball tank to remote, remote to 1/2" coupling to ball valve to T. On the other end of the T is the chamber and on the top a PSI gauge from paintball with 1/8" threads. The chamber is 12 inches long and 1"id. Then a 3/4" bell and ball valve. Barrel is 2' of copper onto a 3/4" copper fitting. I open the regulator on the remote until the psi gauge reads about 90-100 psi then I stop it, close first ball valve and disconect remote, takes about 1sec to fill. Havnt chronied it yet. Ammo is 1/2" round bar cut into 1/2" lengths. My question is how many shots can I get out of a 20oz CO2 tank, if each fill of my 12x1" chamber is 100psi? Will post pics soon.
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Unread postAuthor: boilingleadbath » Fri May 11, 2007 12:54 pm

God...

We've calculated this WAY too many times, and I don't care to do it again.
If someone else wants to do the calculations (and someone <i>might</i>) they can go ahead... but I'm not among them.

If you want to calculate it yourself, it's a pretty simple problem - a strait-forwards application of the ideal gas law.
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Unread postAuthor: Caramanos2000 » Fri May 11, 2007 5:15 pm

Cant you at least PM me if you want to antagonise me. You took more trouble to burn me with your mod laser vision than to answer my question. :shock:
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Unread postAuthor: demilus » Fri May 11, 2007 5:20 pm

If you take it up to 120psi, you can calculate it in the CO2 sticky in the pneumatic section. Just check my post at the end. If you are really fixated on the 100 psi, then go here http://en.wikipedia.org/wiki/Ideal_gas_law and follow the instructions. Be sure to convert everything to the right units. I don't know if you have had chemistry but it's pretty self-explanatory.
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Unread postAuthor: Orpackrat » Fri May 11, 2007 5:25 pm

Why not just test it. I have an all metal launcher that runs on about Co2 at about 800 PSI, I use about an ounce a shot.
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Unread postAuthor: rad14701 » Fri May 11, 2007 5:42 pm

Like Orpackrat said, just test fire it till it's empty... No need for physics or speculation that way... Reminds me of a guy who came to a bonfire party one night that had a compulsive question all night long... Everything he saw brought the question, "Will that burn in the fire?"... Whether it was an empty beer can, beer bottle, Bic lighter, or rotted dead fish, he found the answer by tossing each item into the raging fire... Not the most scientific method, but it always gave a 100% accurate answer to his question... Everything he tried either burned or melted beyond recognition... The only source of disappointment was that nothing blew up... So much for muddling with textbook science... I'm assuming that you built the gun to have fun, not to prove or disprove science... Just have fun and stay safe...
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Unread postAuthor: Caramanos2000 » Fri May 11, 2007 8:19 pm

My friends I think I will go hit myself in the head. Simple enough lmao.
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Unread postAuthor: turbohacker » Fri May 11, 2007 8:29 pm

What the F@%$ is wrong with you?!!
Just fill your CO2 tank and fire it until it is empty, their is no need for a complex equation.
Just ask yourself this; would I rather go spent a half hour (exaderation) doing some dumb equation that I don't really have to do or, would I rather go outside and shoot my gun for a while. If you answered yes to the first one than all hope is lost and we cannot help you :?
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Unread postAuthor: frankrede » Fri May 11, 2007 10:05 pm

Turbohacker, now really.
Your being stupid. Theres no need to needlessly insult him.
If it takes you more than five minutes to do a simple math problem then you have problem.
Maybe he wants and exact answer.
You don't try 100 different psi's to find the good ratio on a propane metered combustion do you?
no you do the math so you can get it right with minimal effort.
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