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First cannon just died, Need idea for a new one!

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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First cannon just died, Need idea for a new one!

Unread postAuthor: Gidney14 » Mon Jun 27, 2011 3:23 pm

First post!

I had an over-under cannon, the simple kind with a ball valve and such, a 2in chamber and 1.5 in barrel that i built using a guide on Wiki-How. About an hour ago the cap on the chamber blew off (Not from over pressurization either, i was only at 70ish PSI, i think it was a defect in it, and yes i know i could repair it an all, but i want a better one xD). It was bitter sweet, but now I have a reason to build a new one.

Im a total noob to this, so bear with me.
I would like it to use a sprinkler valve (Modified)
Be able to shoot tennis balls a good distance (would 250ft be outrageous?)
and charged with a compressor.
made from readily available PVC parts.
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Unread postAuthor: Gun Freak » Mon Jun 27, 2011 3:37 pm

It most likely blew out due to bad gluing practices. Take your time priming and gluing the next one.

I don't think you could do 250 ft with a sprinkler valve. I would do a 2" piston valve, piloted possibly by that sprinkler valve. I would use like a 4' chamber and 3' barrel to keep it compact, but if size is not an issue you can go real big and do like twice that.
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Unread postAuthor: Gidney14 » Mon Jun 27, 2011 3:56 pm

Gun Freak wrote:It most likely blew out due to bad gluing practices. Take your time priming and gluing the next one.

I don't think you could do 250 ft with a sprinkler valve. I would do a 2" piston valve, piloted possibly by that sprinkler valve. I would use like a 4' chamber and 3' barrel to keep it compact, but if size is not an issue you can go real big and do like twice that.



Im building this first off for my own amusement, and secondly for use in an air soft scenario (Not like backyard games, real MilSim), so ill go with those sizes.

Link on a piston valve? The only ones i can dinf are wayyyyy out of my price range.
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Unread postAuthor: Gun Freak » Mon Jun 27, 2011 3:58 pm

I'm talking a homemade piston valve, do you know anything about them?
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Unread postAuthor: Gidney14 » Mon Jun 27, 2011 4:03 pm

Gun Freak wrote:I'm talking a homemade piston valve, do you know anything about them?


Absolutely nothing. :oops:
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Unread postAuthor: jor2daje » Mon Jun 27, 2011 5:00 pm

Better get searching :wink:
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Unread postAuthor: Technician1002 » Mon Jun 27, 2011 5:10 pm

Start in the Wiki. It has the theory. Noob spoon below;
http://www.spudfiles.com/spud_wiki/index.php?title=Valve
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Unread postAuthor: warhead052 » Mon Jun 27, 2011 5:11 pm

Get a quick exhaust valve, and rig that up like a WWII style american bazooka. Just have everything inline with a blowgun trigger and your set. Buy a 2.5" barrel, and you can shoot tennis balls or nerf pocket vortex's.
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Unread postAuthor: Gidney14 » Mon Jun 27, 2011 7:11 pm

So from what i can gather, I'm too much of a noob to use a piston valve. Nuff said.

So, I have thought of another idea.

Blowgun feeding a modded 1in sprinkler valve, then a piece of 1 in PVC, an adapter, then some 2.5in.

Thoughts?
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Unread postAuthor: Gun Freak » Mon Jun 27, 2011 7:30 pm

Gidney14 wrote:Thoughts?

I'm thinking... major flow restriction. If you want to shoot tennis balls far, you can't use a sprinkler valve.

Nuff said. :wink:
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Unread postAuthor: Gidney14 » Mon Jun 27, 2011 7:32 pm

Gun Freak wrote:
Gidney14 wrote:Thoughts?

I'm thinking... major flow restriction. If you want to shoot tennis balls far, you can't use a sprinkler valve.

Nuff said. :wink:


In that case, i would like to see it shoot a bare minimum of 150 feet. Is that doable on a sprinkler valve?

Also, will all of the other parts work?
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Unread postAuthor: Moonbogg » Mon Jun 27, 2011 7:35 pm

you can buy pre made piston valves from spudfiles sponsors. Look in the pneumatic cannon showcase to see how they are built. I think it would be well worth your time and effort to go the piston valve route. I understand they are much more powerful, but i've never built one myself.
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Unread postAuthor: Gun Freak » Mon Jun 27, 2011 8:25 pm

Lol you've built the second coolest hybrid on the site but not a piston valve? :lol:
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Unread postAuthor: saefroch » Mon Jun 27, 2011 8:34 pm

That hybrid HAS a piston valve. :P
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Unread postAuthor: Gidney14 » Mon Jun 27, 2011 9:36 pm

I was told i could get away with just a sprinkler valve, So that's what I will use.
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