SGP - Metal QEV Cannon

[MrCrowley]

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

[th3p0p0]

nice very nice. i like it,it looks very easy to shoot and hold. what kind of range do you get??

[MrCrowley]

Dunno, just finished it about 15minutes ago, I've only done damage shots.

[HaiThar]

How does the ball valve compare to using a blow gun? Is the difference that noticable?

[MrCrowley]

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.

[mopherman]

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?

[MrCrowley]

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.

[jackssmirkingrevenge]

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?

[MrCrowley]

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.

[MrCrowley]

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?

[dauphinoise potato]

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.

[MrCrowley]

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.

[nivekatoz]

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....

[BigJon]

Yes you could. Most quick exhaust valves trigger by just a slight drop of pressure in the pilot if im not mistaken.

[MrCrowley]

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.