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new cannon 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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new cannon build ???

Unread postAuthor: mattyzip77 » Tue Jul 19, 2011 7:38 pm

I want to make a pneumatic cannon, but wanna keep it smalller. I was thinking like a 2 inch chamber like 24 to 30 inches with a sprinkler valve and a few different barrels like a golf ball barrel, a marble barrel, and so on. Will I get much power out of this without making a piston valve??
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Unread postAuthor: Gun Freak » Tue Jul 19, 2011 7:41 pm

Define much power? It will be ok.
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Unread postAuthor: mattyzip77 » Tue Jul 19, 2011 7:47 pm

like how far will I get outta a golf ball at 125 psi???
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Unread postAuthor: Gun Freak » Tue Jul 19, 2011 7:51 pm

Maybe 100 yards but try using ggdt to help find out.
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Unread postAuthor: mattyzip77 » Tue Jul 19, 2011 7:56 pm

damn thats it, maybe I should jump up a inch to 3 inch for a chamber, or make the 2 inch longer. I have a big assortment of pipe to choose from thats free, so, decisions decisions!!!!
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Unread postAuthor: tony48 » Tue Jul 19, 2011 8:13 pm

Are you experienced with piston valves? I would recommend building a coax piston valve. They're so powerful And simple to build. Also great first piston valve project. If it was possible to easily incorporate changeable barrels into a coax then it would be the best kind of cannon in my opinion.

But I think if you built one that was either golf ball or 1" barrel or anything else then you would be very happy with the power
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Unread postAuthor: warhead052 » Tue Jul 19, 2011 8:39 pm

Matty, a bigger chamber won't solve your problems. Bigger is not always better, unless its pressures :D

What you need is a quick exhaust valve, and a slide valve. Take a look at LockednLoaded's Tacticool mortar to see what I mean. (Just don't bump his thread ok?)
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Unread postAuthor: mattyzip77 » Tue Jul 19, 2011 8:39 pm

Tony 48 I have yet to build a piston valve. This will be my 2nd pneumatic so Im taking it slow, learning as much as I can before I start on a piston valve. Dont get me wrong, I would love to build one, Im just the kind of person that needs to see things first hand, and not from a diagram or blue prints!!
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Unread postAuthor: Gun Freak » Tue Jul 19, 2011 8:40 pm

QEV ain't big enough Warhead, he needs a 2 inch piston valve.
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Unread postAuthor: warhead052 » Tue Jul 19, 2011 8:44 pm

*facepalm* I really wish I got more pictures of the cannon I made for a friend. It used a 2" by 2' chamber, and a 3/4" QEV with a 1/4" blowgun, and a 2" by 2' barrel. I shot a nerf pocket vortex about 200 meters before it starting falling back to earth. And that was straight up. I put on a 3/4" barrel, and I shot a cork at about 700 fps thanks to you putting the numbers in for me.
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Unread postAuthor: Gun Freak » Tue Jul 19, 2011 8:56 pm

200 meters straight up on a 3/4" QEV? I doubt that, not enough flow IMO. A 2" piston will work wonders.
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Unread postAuthor: warhead052 » Tue Jul 19, 2011 9:08 pm

This thing has power. I shot a shotgun load of foam pellets from a bean bag through sheet metal.
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Unread postAuthor: irisher » Tue Jul 19, 2011 9:57 pm

I have a hard time believing that you shot through sheet metal with styrofoam.
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Unread postAuthor: Gun Freak » Tue Jul 19, 2011 9:59 pm

Maybe it was aluminum foil :tongue3:
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Unread postAuthor: Mr.Tallahassee » Tue Jul 19, 2011 10:33 pm

A simple piston valve that you can build with minimal knowledge is a bolt and washer piston. They aren't very picky IMO. Mine has worked like a charm and is an amazing improvement over my modded sprinkler valve. I shoot AA batteries with an airtight sabot at about 315fps with 85.5 ft/lbs(116 Joules). Mine is only a 1'' seat in a 1.5'' tee.
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