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SGP - Metal QEV 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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SGP - Metal QEV Cannon

Unread postAuthor: MrCrowley » Sat Oct 06, 2007 8:19 pm

This is my second gun from the supplies I got from America.

This one is called SG - Penetrator because of the awesome damage it can do with a paintball.

Until I get a metal barrel i'm borrowing my DSGR/SGI paintball barrel which works like a charm.

Specs:

Barrel Diameter: Currently .5"/15mm
Chamber Diameter: 1" and 1.5"/25mm and 40mm
Barrel Length: 36"/90cm
Chamber Length: Around 30cm I guess
Valve: 3/4" QEV
Fill Valve: Schrader
Pilot Valve: 1/2" ball valve
Operating Pressure: Around 100-120psi
Ammo: .68" paintballs

Not really much to say here, pictures say it all. Video coming soon, just need to upload it.

Oh yeah it's not exactly clean looking, but hey it works :D
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Attachments
Fill Setup.JPG
Fill Setup
Front View.JPG
Front View
Back View.JPG
Back View
Back End.JPG
Back End
Penetration.JPG
I call that penetration, just got through at the bottom. Paintball at 120psi
Almost There.JPG
Almost there at 100psi
Wood Thickness.JPG
Thickness of the chipboard I was shooting
Over-View.JPG
Over-View
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Unread postAuthor: th3p0p0 » Sat Oct 06, 2007 8:22 pm

nice very nice. i like it,it looks very easy to shoot and hold. what kind of range do you get??
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Unread postAuthor: MrCrowley » Sat Oct 06, 2007 8:27 pm

Dunno, just finished it about 15minutes ago, I've only done damage shots.
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Unread postAuthor: HaiThar » Sat Oct 06, 2007 8:55 pm

How does the ball valve compare to using a blow gun? Is the difference that noticable?
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Unread postAuthor: MrCrowley » Sat Oct 06, 2007 8:59 pm

Hell yeah, my pilot volume is way to big for a blow gun. It actuates the QEV but lets out a lot of air before the QEV actuates.
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Unread postAuthor: mopherman » Sat Oct 06, 2007 9:22 pm

have you already used up all your american parts? The gun looks great, aside from the big pilot. what is that fitting on your pilot setup?
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Unread postAuthor: MrCrowley » Sat Oct 06, 2007 9:28 pm

Nah, well I got a GB gun in the making, similar to my PB gun I just made, except it has a 4" chamber and a GB barrel. I also bought some fittings for 2 other guns I need to fix up but I still have quite a few left over.

Not sure what it is, I bought a whole box of galv fittings awhile back and it came with them. I have a few more.
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Unread postAuthor: jackssmirkingrevenge » Sat Oct 06, 2007 10:00 pm

a) shame on you for the gargantuan pilot volume :?

b) don't you think 120 psi is a little too kind on an all-metal launcher?
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Unread postAuthor: MrCrowley » Sat Oct 06, 2007 10:07 pm

Well the QEV is only rated for 150psi, my crappy Wal*Mart pump can't do more then 120, and my compressor is limited to 115psi.

Yeah I know it's a tad huge, but I had an extra 1/4" tee I was gonna use so I could fit everything in(guage, schrader,pilot valve etc) but a fitting snapped inside it and rendered it useless. So I had to improvise with the little small diameter fittings I had left.

I'm thinking of putting a tee where the 90* elbow is on the chamber, and having the guage come out the back of it, then I could get rid of the huge 3 way thingy in my pilot area and just have that 1/4" tee there and hook my blowgun up to that where the guage is.
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Unread postAuthor: MrCrowley » Sun Oct 07, 2007 12:36 am

GGDT says otherwise, I can't get an increase or decrease in velocity by increasing or decreasing the pilot volume within a reasonable amount.

Though my figures for the QEV were pretty half ass mixed figures from an old SGTC thread. Does anyone have some proper ones?
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Unread postAuthor: dauphinoise potato » Sun Oct 07, 2007 5:13 am

OOh thats great, pretty wierd pilot setup though... I would think it's safe to take that thing up to about 300psi, in little bits though.
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Unread postAuthor: MrCrowley » Mon Dec 24, 2007 2:00 am

Successfully cleaned a drain pipe with this cannon today, got water all over me but hey it worked and I gained praise from my once unsupporting parents. :D
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Unread postAuthor: nivekatoz » Sat Dec 29, 2007 5:11 pm

I don't know much about QEV's but couldn't you trigger the valve with a blow gun???? because all the ball valves makes it look a little bulky...but thats just me.....other than that I like it, its cool....
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Unread postAuthor: BigJon » Sat Dec 29, 2007 5:44 pm

Yes you could. Most quick exhaust valves trigger by just a slight drop of pressure in the pilot if im not mistaken.
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Unread postAuthor: MrCrowley » Sat Dec 29, 2007 6:01 pm

nivekatoz wrote:I don't know much about QEV's but couldn't you trigger the valve with a blow gun???? because all the ball valves makes it look a little bulky...but thats just me.....other than that I like it, its cool....


Yes but I would have poor performance. I actually have a 1" sprinkler piloted by a blow gun as the pilot valve now.
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