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Built a pneumatic cannon? Then post it here! This section is for completed, finished cannons that you have built. Please include pictures and information.
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Unread postAuthor: abcdefg » Sat Nov 25, 2006 6:20 pm

Could i use a 20 oz co2 from a paintball gun!?!?




after all it is a lot of pressure (3000psi)
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Unread postAuthor: Scope » Sat Nov 25, 2006 6:21 pm

Yes you need a regulator.
Alot of people recomend palmer but they are very very expensive.
Also i recomend using a remote with a inline check so that u can disconnect it
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Unread postAuthor: )DEMON( » Sat Nov 25, 2006 6:51 pm

Co2 in pvc, big no no. Co2 will cool the pvc to the extent of it becoming brittle and fracturing.

Co2 in its liquid form in a paintball tank normally sits around 850 psi, not 3000, that is Hpa.

You need a Palmers adjustable female regulator if you want to run anything off your co2 tank. Do some research. The question you asked is not a yes or no for an answer.
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Unread postAuthor: Scope » Sat Nov 25, 2006 7:33 pm

As long as you hook it up to a big enough expansion chamber it should not cool ur chamber so much.
Co2 is only cold when its changin forms(tell me if im wrong but im pretty sure)
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Unread postAuthor: CpTn_lAw » Sun Nov 26, 2006 6:26 am

you're right, but the PVC part that ould be near the entrance would cool too much....
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Unread postAuthor: Scope » Sun Nov 26, 2006 8:28 am

instead of spending all that money on a regulated co2 set.
just buy a HPA or nitro tank with a regulator on the bottle.
They pressureize up 2 3000 like u said so they should be worth a few fills
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Unread postAuthor: sergeantspud2 » Sun Nov 26, 2006 8:44 pm

But the regulator on those tanks dont let you adjust what the output pressure is. Most HPA tanks output at room temp co2 at 800psi but you can find some tanks that will regulate to around 300-400psi. So you will still need a secondary regulator but the problem with the brittle pvc will be solved.
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:D Always rely on Murphy's Laws :D
4.If you have enough grease & a big enough hammer, you can put anything... anywhere
3.If all else fails, hit it with a big hammer
2.Matter will be damaged in direct proportion to its value
1.If anything simply cannot go wrong, it will anyway
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Unread postAuthor: Scope » Sun Nov 26, 2006 8:56 pm

Well even if it is dumping at 300 psi wont it just expand into all the empty space in your cannon till it fills to your desired psi. the only difference between using a regulator would be it fills slower right??

So if you use a ball valve you could ditch the 2nd regulator and just watch ur chamber gauge.
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Unread postAuthor: sergeantspud2 » Sun Nov 26, 2006 9:14 pm

But what happens if you sneeze (or other accident) and the ball valve is left open past the rated pressure... you lose a limb.

So basically a regulator is your fail safe.
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:D Always rely on Murphy's Laws :D
4.If you have enough grease & a big enough hammer, you can put anything... anywhere
3.If all else fails, hit it with a big hammer
2.Matter will be damaged in direct proportion to its value
1.If anything simply cannot go wrong, it will anyway
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Unread postAuthor: Scope » Sun Nov 26, 2006 9:24 pm

how about a pop off valve??
isnt a pop valve alot cheaper then say a palmer reg
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Unread postAuthor: sergeantspud2 » Sun Nov 26, 2006 9:35 pm

True but with a big chamber they wont empty as fast at 800 psi comming in. By the way I also believe that palmers are a little over priced so I made my own co2 regulator.

<a href="http://photobucket.com/" target="_blank"><img src="http://i102.photobucket.com/albums/m111/sergeantspud/regulator.jpg" border="0" alt="Photobucket - Video and Image Hosting"></a>

Cost me around $40
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:D Always rely on Murphy's Laws :D
4.If you have enough grease & a big enough hammer, you can put anything... anywhere
3.If all else fails, hit it with a big hammer
2.Matter will be damaged in direct proportion to its value
1.If anything simply cannot go wrong, it will anyway
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Unread postAuthor: SpudStuff » Sun Nov 26, 2006 9:42 pm

Isn't that a palmer on there?
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Unread postAuthor: sergeantspud2 » Sun Nov 26, 2006 9:45 pm

Nope its a "dead on paintball" regulator I got it for $35 including shipping on ebay. And the stupid thing about it is theres only one screw and it doesnt adust the pressure, but I still get 90-120 psi out of it.
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:D Always rely on Murphy's Laws :D
4.If you have enough grease & a big enough hammer, you can put anything... anywhere
3.If all else fails, hit it with a big hammer
2.Matter will be damaged in direct proportion to its value
1.If anything simply cannot go wrong, it will anyway
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Unread postAuthor: SpudStuff » Sun Nov 26, 2006 9:50 pm

Oh... probably a factory reject. Or a broken one off a paintball gun.
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Unread postAuthor: sergeantspud2 » Sun Nov 26, 2006 9:52 pm

Yeah Im thinkin its a factory reject but what does it matter now? Its doing what I want it to.

Also one thing that Ive noticed my 68ci 4500 tank doesnt hold as much as I thought it would so just beware when spending that much.
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:D Always rely on Murphy's Laws :D
4.If you have enough grease & a big enough hammer, you can put anything... anywhere
3.If all else fails, hit it with a big hammer
2.Matter will be damaged in direct proportion to its value
1.If anything simply cannot go wrong, it will anyway
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