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Twin chamber Gun project help

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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Twin chamber Gun project help

Unread postAuthor: Backdraft » Wed Aug 06, 2008 12:04 am

Hey guys, im not new here, just a new name. Been a while forgot what my old name was. i think it was jfd140 or something iuno.

Anyway, i gave up building launchers for a bit and yesterday i strolled through my garage and noticed my 4" pipe and fittings all lonely in the dust pile.

I had started this project a while ago and never finished it.

The launcher is a simple concept, two chambers, 4" pipe by 3 feet roughly, with a 4x2 bushing on one end and a cap at the other. The chambers will be linked to one another to make 1 chamber out of the 2. And ultimately 2 valves will release into a 2" barrel with a camlock on it for quick connecting.


So, heres where i stand. I have both tanks made up, with a cap on one end and a 4x2 bushing on the other. What i have bought for valves is a pair of orbit watermaster 1" valves. I am fully aware that these valves can not possibly dumb the air stored in both tanks efficiently.

So heres my question

Is it that stupid to use the watermasters?

How hard would it be to make my own piston valve, i remember giving it a shot once but giving up after hot glue piston was epic fail.

Is there a good full guide out there to making one? I have been gone a long time.

AND ultimately i want the gun to be electronically trigged, so im gonna be using the watermasters somewhere. Electronic in my eyes is safer so i want it electronic. And missle arming switch with light up fire button is just worth it.
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Unread postAuthor: Gippeto » Wed Aug 06, 2008 12:18 am

Personally, I would just make and use one piston valve. (Psst...It's really not that hard! Don't tell anyone I told you.) :)

Pilot it with the sprinkler to achieve your goal of electronic firing. (DUH!)


Start here;

http://www.spudfiles.com/forums/piston- ... t8157.html

Then read this;

http://www.spudfiles.com/forums/how-to- ... 10381.html
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Unread postAuthor: Backdraft » Wed Aug 06, 2008 1:11 am

o yea, also how well will quick connect air fitting and other 1/4" npt fittings hold up screwed into the pvc? I was thinking it best to screw them in where the cap or coupler are for thicker material sake.

When i screw them in i use a 1/4" NPT titanium hole tap for a perfect screw hole.

If i do it this way, should i bother epoxying them in?
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Unread postAuthor: frankrede » Wed Aug 06, 2008 1:21 am

If you properly tap the hole, you shouldn't have to epoxy it in.
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Unread postAuthor: Backdraft » Wed Aug 06, 2008 6:59 am

i dont know if its worth the time to make a piston valve, i have no idea how to build one.

Will i still get alot of power out of the 2 sprinkler valves electronically powered? Or will it be too weak in comparison to be worth it... Im not looking to shoot 600 yards. Just make a really cool looking cannon.
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Unread postAuthor: blind909 » Wed Aug 06, 2008 11:02 am

If You Really Want To Do It Efficiently, have a ball valve before the sprinklers, so you can fire off 1 chamber at a time. That will give it about the same amount of power, but 2 shots from 1 fill, and you will be able to use the sprinklers efficiently. BUT NOT AS GOOD AS PNUEMATICLY ACTUATED :D
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Unread postAuthor: Backdraft » Wed Aug 06, 2008 11:49 am

if i did that i dont need a ball valve... 2 separate switches lol... same effect.

I might integrate it so that u can do either way, 2 shots or 1 larger.
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Unread postAuthor: Hubb » Fri Aug 08, 2008 6:54 am

Take the time and make a piston, piloted with a Watermaster. That will be worth it, too.
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