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High power questions

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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High power questions

Unread postAuthor: NewB » Sat Oct 13, 2007 9:41 pm

I want to make a high powered 223 cal. gun and I have some questions.
What type of pipe should I use?
What type of valve should I use?

I would like the barrel to be thick enough so that I can have it rifled over at Gander Mt.

If I could have some help that would be great. :)
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Unread postAuthor: LikimysCrotchus5 » Sat Oct 13, 2007 9:46 pm

I guarantee you if you would look around, you would find your information needed. Or if you cant, then pm a person whp would know, but not me :)
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Unread postAuthor: NewB » Sat Oct 13, 2007 9:57 pm

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Unread postAuthor: DYI » Sat Oct 13, 2007 10:06 pm

If you want this to be .223 calibre and "high powered", you're going to need a lot more than 300 psi. To force a solid (non vegetable) projectile throught rifling in such a small calibre, you may need thousands of psi.

As for pipes and valves, you want the strongest and biggest pipes and the strongest, fastest, and biggest valve you can afford.
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Unread postAuthor: BC Pneumatics » Sun Oct 14, 2007 12:54 am

Rifling will tear out of a plastic pipe (obviously), and you are unlikely to find a pipe that is the perfect fit for a .223 round. It would be cheaper to have the end of a standard .223 barrel threaded to attach to your system than to get a custom barrel bored and rifled.
I agree that a powerful air source will be required to push the bullet through the rifling. Perhaps you would look into building a .22 air rifle, that uses standard .22 air rifle rounds? I have a feeling this will be much more practical.
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Unread postAuthor: NewB » Sun Oct 14, 2007 9:04 am

Would that shock pump connect to a tire valve and be able to fire the .22 air rifle round at a high velocity?
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Unread postAuthor: jackssmirkingrevenge » Sun Oct 14, 2007 9:12 am

NewB wrote:Would that shock pump connect to a tire valve and be able to fire the .22 air rifle round at a high velocity?


Using a shock pump as an air source I've taken 0.22 airgun pellets beyond 700 feet per second in my 6mm pneumatics. Using 0.177 pellets in a smaller barrel will yield lower energies but higher muzzle velocities.
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Unread postAuthor: NewB » Sun Oct 14, 2007 10:31 am

Does the shock pump connect to a tire valve?
Also would I need to make a piston or is their a metal sprinkler valve that I could use and would a blowgun be be strong enough to use as a pilot valve?
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Unread postAuthor: jackssmirkingrevenge » Sun Oct 14, 2007 11:30 am

Does the shock pump connect to a tire valve?


Yes, you can use an ordinary schrader tyre valve.

Also would I need to make a piston or is their a metal sprinkler valve that I could use and would a blowgun be be strong enough to use as a pilot valve?


You can use a metal quick exhaust valve as these are normally rated to higher pressures than sprinkler valves and yes, blowguns have been used as pilots for high pressure pneumatics.
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Unread postAuthor: NewB » Sun Oct 14, 2007 1:59 pm

Would it be safe to use a metal quick exhaust valve and blowgun at 300 psi?
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Unread postAuthor: veginator » Sun Oct 14, 2007 3:23 pm

It depends on what they are rated to if you try that with the first qev you can find you will have a very expensive burst disk on your hands so do some researching before you do anything.
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Unread postAuthor: NewB » Sun Oct 14, 2007 5:41 pm

Where can I find a quick-exhaust valve that can hold 300 psi?
I can only find up to 150psi.
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Unread postAuthor: DYI » Sun Oct 14, 2007 6:48 pm

Most QEVs are only rated for 150 psi. Just make your own. It will be cheaper.
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Unread postAuthor: NewB » Sun Oct 14, 2007 7:01 pm

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Unread postAuthor: Brian the brain » Mon Oct 15, 2007 10:35 am

Yep.If there were 300 psi quick exhausts we wouldn't be using the 150 psi ones now would we..

Wow..just imaginge a 900 psi / 2" QEV...
Well whatever..
Why try and find a pipe that fit;s the ammo??
It's so much easier the other way around...
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