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first constant air/sprinkler 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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first constant air/sprinkler cannon.

Unread postAuthor: ajnin » Wed Aug 22, 2007 1:16 am

Ok I have most likely 90% of the parts I need. Hopefully you guys can help me with the other 10%.

The tank is said to be adjustable 0-1200 psi, i will most likely use a palmers stabilizer which will act as a safety. is this needed?

am i going to be better off using compressed air or co2? availability of either is not a problem.

i would sorta like to keep the valve electronic, i have read that converting it to using a blowgun will increase power. i plan on using this for scenario paintball shooting either sabot style rounds or nerf vortex's. is the "power" difference going to be that big of a deal?

anyone ever used battery packs from rc cars for power?

last thing before the pics, is there a 150 ish psi burst disc? that would make me feel much safer, the sprinkler valve sits right next to my head.

http://www.fatalpaint.com/images/ajnin/cannon1.jpg
http://www.fatalpaint.com/images/ajnin/cannon2.jpg
http://www.fatalpaint.com/images/ajnin/cannon3.jpg

i hope i am atleast going in the right direction.
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Unread postAuthor: frankrede » Wed Aug 22, 2007 1:24 am

You need a bigger chamber, with your current setup, I wouldn't expect the ammo to leave the barrel.
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Unread postAuthor: f.c » Wed Aug 22, 2007 5:05 am

mate you need a much larger chamber. but other wise nice so far.
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Unread postAuthor: chaos » Wed Aug 22, 2007 5:11 am

i reckon he should just use a smaller diameter barrel, like for marbles, darts and stuff like that
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Unread postAuthor: Redcoat » Wed Aug 22, 2007 5:33 am

i agree with chaos use a smaller barrel and shoot marbles or lead sinkers.
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Unread postAuthor: to_live » Wed Aug 22, 2007 6:26 am

i plan on using this for scenario paintball shooting
thats all[/quote]
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Unread postAuthor: homedepotpro » Wed Aug 22, 2007 10:34 am

what about the cell core abs he's using, does anyone else see a problem with that
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Unread postAuthor: Intel Xeon » Wed Aug 22, 2007 10:55 am

It's a barrel. It's exposed to pressure for mere milliseconds. Plus, pressure rated pvc would be a pain to lug around
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Unread postAuthor: VH_man » Wed Aug 22, 2007 11:02 am

that regulator should work fine. i am getting one for the main regyulator on the 9mm airsoft rifle.

and yes, make the camber have at least the same volume as the barrel.........
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Unread postAuthor: BigJon » Wed Aug 22, 2007 11:11 am

I think you should build a chamber for it because with that big of a barrel I don't think that you'll get much power out of it. And as far as a 150 psi burst disc goes I would just put a pop-off valve on it. But keep the C02 for portability.
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Unread postAuthor: homedepotpro » Wed Aug 22, 2007 12:35 pm

sorry assumed that was the chamber for some reason
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Unread postAuthor: PinHead » Wed Aug 22, 2007 5:16 pm

The way that it looks to me, you don't even have a chamber, really, other than the fittings that go straight from your HPA tank to the sprinkler valve.

You should have a chamber that is just about as big as your barrel; you're going in the right direction tho. Theoretically you could shoot it the way it is, but in order to make it shoot anywhere you'd have to have your regulator cranked waaaaaaaaaaaaaaay up. Think about it - a typical paintball gun uses several hundred PSI to shoot something less than an inch in size, because it uses a low volume of air at high pressure. How much pressure do you think it would take to shoot something as big in caliber as a nerf football? Problem is, you can't even crank it that high anyways, cause your sprinkler valve won't take it.

The solution that almost all pneumatic guns on here use is to go with a larger volume of air to make up for the lack of pressure that you're limited to. I'd say shoot for a chamber volume that's about 80-100% of your barrel volume. From what I've seen on other guns of this style, you shouldn't need to go over 100 PSI (probably less) in order to get your desired speed. On the field, your gun will be limited by the chrono anyways.

Like I said, you're on the right track; just go ahead and add your chamber, and plumb your REGULATED air (good choice on the Palmer's reg, they're the best) straight into it. Then have your sprinkler valve coming out of that.
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Unread postAuthor: DYI » Wed Aug 22, 2007 5:51 pm

First off, I'd like to point out that that is one really strange tee you have there.

I'd also like to join the group of people who are saying something along the lines of "WTF dude. Where's your chamber?"

For the low pressures that that sprinkler valve can handle, you need a chamber at least 25% of the barrel size. With a larger chamber, say, 100-200% the size of the barrel, you could achieve a larger range of performance, depending on the pressure that you use.
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Unread postAuthor: MisterSteve124 » Wed Aug 22, 2007 5:58 pm

You also need to put some teflon tape on those fittings, I'm assuming that you haven't because I don't see any.
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Unread postAuthor: DYI » Wed Aug 22, 2007 6:00 pm

I don't think that it's really built yet, just put together to show us what it looks like. He may also be using some form of pipe dope which is difficult to see.
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