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Pneumatic breech-loaded cannon

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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Pneumatic breech-loaded cannon

Unread postAuthor: Sear » Fri Dec 23, 2016 9:04 am

This is my 37mm cannon in construction. HPA system operating at 10-50 bar is not yet installed, it will be held under the barrel. It contains EM valve 1/2" and custom-built stainless steel 0,5L air reservoir (rated at 60 bar/870 psi).
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37mm gun.jpg

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Re: Pneumatic breech-loaded cannon

Unread postAuthor: Kensingt0n » Sat Dec 24, 2016 8:28 am

Dude, this is some seriously beautiful looking work, good stuff mate :)
When you say "EM" valve, what type of valve do you mean?
Can't wait to see the tank on her and ready for shooting, keep it up matey, and merry christmas!
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Re: Pneumatic breech-loaded cannon

Unread postAuthor: Sear » Sat Dec 24, 2016 8:44 am

Thanks! It should be finished in March/April hopefully. The valve is 24V DC 1/2" rated to 50 bar. The air goes from scuba tank through initial regulator and safety valve.
Merry Christmas!
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Last edited by Sear on Sun May 28, 2017 5:36 pm, edited 2 times in total.

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Re: Pneumatic breech-loaded cannon

Unread postAuthor: cowscankill » Sat Dec 24, 2016 5:02 pm

Oh man I love that style, can't wait to see it in action.
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Re: Pneumatic breech-loaded cannon

Unread postAuthor: Xamllew » Mon Dec 26, 2016 6:55 pm

Whoah, I've never seen a pneumatic AA cannon (at least that's what I thought it was at first). Damn good looking turret, looks rock solid.
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Re: Pneumatic breech-loaded cannon

Unread postAuthor: Sear » Tue Dec 27, 2016 4:21 am

It's only an "anti-tank gun" with max elevation of 23°. The gun shield will be installed at the end.
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Re: Pneumatic breech-loaded cannon

Unread postAuthor: Sear » Sun May 28, 2017 3:16 pm

I don't want to deprive you of the experience of the finished project.

The ammo are soft foam based, non-lethal, unmistakably marking shots intended against vehicles and fortifications on action games like paintball. I always wanted to shoot the real stuff...
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_DSC5413 (1).jpg
Paintball anti-tank gun
Last edited by Sear on Wed May 31, 2017 2:50 am, edited 1 time in total.

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Re: Pneumatic breech-loaded cannon

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Re: Pneumatic breech-loaded cannon

Unread postAuthor: jackssmirkingrevenge » Mon May 29, 2017 3:40 am

Very impressive! Do you actually load cartridges or do you put the projectiles in directly? What does the ammunition look like?
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Re: Pneumatic breech-loaded cannon

Unread postAuthor: Sear » Mon May 29, 2017 4:44 am

I load cartridges. It solves several things at once; transporting of fragile ammo, loading of fragile ammo and it looks and feels perfect. Empty cartridge is ejected at the end of the breech opening cycle.

I don't have any drawing or standalone photo of the ammo (yet). But the shot is drag stabilized. What you see protruding from the cartridge is the main body of the shot, hidden in the cartridge are simple X shaped stabilizers of the same diameter.
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Re: Pneumatic breech-loaded cannon

Unread postAuthor: jackssmirkingrevenge » Mon May 29, 2017 5:14 am

Empty cartridge is ejected at the end of the breech opening cycle.


Is there a spring loaded ejector?

Also do you feed air through the base of the cartridge?
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Re: Pneumatic breech-loaded cannon

Unread postAuthor: Sear » Mon May 29, 2017 5:30 am

The ejection mechanism is actually more simple then that. But it requires quick breech opening to reliably eject the cartridge (which is quite natural actually).
And yes, the air goes through the base of the cartridge.
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Re: Pneumatic breech-loaded cannon

Unread postAuthor: jackssmirkingrevenge » Mon May 29, 2017 5:43 am

That sounds pretty sweet. A video would be nice!
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Re: Pneumatic breech-loaded cannon

Unread postAuthor: Sear » Sun Jun 11, 2017 3:45 pm

I'm going to make a proper video in the beginning of July. I'm still fine tuning several parts of the gun. For the time being, a new photo of the gun and a snapshot from safety tests. One hit is from the gun (2m distance), another one from paintball marker (tournament-grade paintball, 1m).
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Attachments
_DSC5437.jpg
paintball anti-tank gun
_DSC5448.jpg
safety test

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Re: Pneumatic breech-loaded cannon

Unread postAuthor: farcticox1 » Sun Jun 11, 2017 4:02 pm

shooting people is the safety test ? :shock:
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Re: Pneumatic breech-loaded cannon

Unread postAuthor: Sear » Sun Jun 11, 2017 4:18 pm

Safety test of the ammo - yes it is. You may start with some arbitrary tests, but at the end you need to verify it on your own flesh. This was not my own flesh, but he was second in the row. A brave fellow indeed!
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