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a 3,000 psi cannon

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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a 3,000 psi cannon

Unread postAuthor: grumpy » Fri Oct 26, 2007 9:27 am

i am planning on building a new launcher that will operate at 3000 to 4000 psi ( no this is not a typo ) , the presure chamber will built out of a 2' 6"x 2" sch 160 carbon steel pipe, the barrel will be of same pipe except 1" in diameter ( length still to be determined ) . the valve i'm going to use is a 2 ball valve rated for upto 6,000 psi, will most likely put a spring on the ball valve to help open it faster , i'm hoping to get some very high fps with thi setup, so what do think ?
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Unread postAuthor: Hotwired » Fri Oct 26, 2007 9:50 am

I think you'd better have access to a HPA or nitrogen tank.

Also that you shouldn't hold it. Such a large volume of 3-4kpsi gas and a 1" barrel would be fairly likely to dislocate or break whatever was behind it.

You will get high fps though if it all works out.
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Unread postAuthor: jackssmirkingrevenge » Fri Oct 26, 2007 10:02 am

Most modern precharged pneumatic rifles operate at that presssure, but never seen one at 1" calibre :shock: I hope you have your ear protection sorted :D
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Unread postAuthor: Fnord » Fri Oct 26, 2007 10:19 am

Eh.. you can take it. Be a man :P

ok, just kidding. Depending on the projectile weight, it'll probably feel like a 4-bore shotgun.
If you do decide to hold it, think big stock+padding.

Make a pneumatic cylinder with a small low pressure tank to open the ball valve. It'll probably work better than a spring and shouldn't be hard to rig up either.
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Unread postAuthor: jackssmirkingrevenge » Fri Oct 26, 2007 10:55 am

_Fnord wrote:Eh.. you can take it. Be a man :P


Without ear protection, you'll only have to "take it" once. Subsequent firings will be easy :D
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Unread postAuthor: ALIHISGREAT » Fri Oct 26, 2007 11:45 am

i reckon you should make it a smaller bore so you could shoot marbles at insane velocitys.

however i thought that you can't propel something past the speed of sound with a normal pnuematic so i don't think there would be much point making it such high pressure unless you want to fire heavy things fast.

also have you thought about using helium?
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Unread postAuthor: jackssmirkingrevenge » Fri Oct 26, 2007 12:03 pm

however i thought that you can't propel something past the speed of sound with a normal pnuematic


yes you can ;)
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Unread postAuthor: ALIHISGREAT » Fri Oct 26, 2007 12:26 pm

i saw that somewhere before, can't remember where though, but don't you get dieseling in some air rifles which allows them to go supersonic.
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Unread postAuthor: jackssmirkingrevenge » Fri Oct 26, 2007 12:39 pm

that's true of springer rifles, but the Condor linked to above is a pure pneumatic that goes supersonic by virtue of it's high pressure chamber (over 3,000 psi) and extremely efficient inline hammer valve.
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Unread postAuthor: ALIHISGREAT » Fri Oct 26, 2007 12:42 pm

hmm can;t remeber who i heard it off them must be wrong.
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Unread postAuthor: Killjoy » Fri Oct 26, 2007 12:45 pm

Depending on the projectile weight, it'll probably feel like a 4-bore shotgun.
If you do decide to hold it, think big stock+padding.

It might also help to have a recoil absorbing stock + the padding.

As I recal the mythbusters built a cannon somewhat similar to the one your planning (except smaller) for a car grappling hook, and the recoil was unbeliavble. So a heavy duty, extremely solid stand would also be a requirment.
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Unread postAuthor: ALIHISGREAT » Fri Oct 26, 2007 1:34 pm

it would have to be one hell of a recoil absorbing stock for the amount of recoil.
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Unread postAuthor: LikimysCrotchus5 » Fri Oct 26, 2007 1:55 pm

Make a pneumatic cylinder with a small low pressure tank to open the ball valve. It'll probably work better than a spring and shouldn't be hard to rig up either.

If you decide to do this, which i think would increase your performance, then you will need another seperate air chamber for powering the pneumatic cylinder. If you need help with using a pneumatic cylinder or mounting it or anything, just contact the user name idiotfactory and he will help you with this. Mention me and he will know what you are talking about.
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Unread postAuthor: psycix » Fri Oct 26, 2007 3:51 pm

Why not make a custom piston valve? :D


Nah a ball valve will do.
But take one hell of a long barrel though and maybe use lighter gasses (helium!)
I cant wait to see it!

But how do you wanna reach 3000 psi? A normal compressor cant do that.
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Unread postAuthor: ALIHISGREAT » Fri Oct 26, 2007 4:03 pm

also have you thought about using helium?


and it would have to be a very strong piston with a very strong housing with a very strong bumper etc.
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