My QEV copper cannon

Show us your pneumatic spud gun! Discuss pneumatic (compressed gas) powered potato guns and related accessories. Valve types, actuation, pipe, materials, fittings, compressors, safety, gas choices, and more.
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chaos
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Wed Apr 04, 2007 8:41 am

nah dw bout that i had a bdm(brain dead moment) it doesn't really matter what c:b ratio u use as long as you have more pressure in the chamber than the barrel.

:? i use a bit over 2:1 but opinions vary from person to person

as joannaardway said 1:1 is fine an can achieve amazing results.
spanerman
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Wed Apr 04, 2007 8:58 am

oh ok, heres a damage pic from its old config
Image

it sure did have some power
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chaos
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Wed Apr 04, 2007 9:01 am

im sure that a lot of guns could accomplish that, but hey damage pics are always kool.

q: what did ya use for ammo to do that?
leeeeshad
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Wed Apr 04, 2007 10:06 am

maby the big bolt next to it
chubster wrote:how do you saw the head off the nail?
spanerman
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Wed Apr 04, 2007 10:20 am

^hes not wrong :P
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chaos
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Wed Apr 04, 2007 11:26 pm

oh yer lol thats some nice ammo but i bet it spins after 10-15m.

and whats your suggestion on how fast it was traveling?


soz i didn't see it properly before, i was at mums an it only half loaded the pic.
spanerman
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Thu Apr 05, 2007 3:51 am

with that pojectile id hazzard a guess at 400fps its quite hefty
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lukemc
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Thu Apr 05, 2007 7:43 am

that screw / bolt things scary! is it accurate?
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spanerman
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Thu Apr 05, 2007 11:00 am

well i can consistently hit cans at 10m with itbut ive retired it as it no longer fits in the barrel and its destroyed my backstop :lol:
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Flying_Salt
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Thu Apr 05, 2007 11:31 am

A little late, but that's a nice little cannon. I would build something out of copper, but I don't have the tools for soldering anything. (Plus its so darned expensive over here!)
You should see if you'd be able to mod a blowgun. They look a lot nicer and are eaiser to open than ball valves. (And yours seems to have no rubber handle cover thing on it, so it's probably not too comforable.)
I think some arrow shops, where you buy hunting arrows, might have little chronys. I know one near me does. If you convince them and offer them gummy bears and marshmallows, they might let you use it, if you promise not to blow it apart. I brought in a picture of my pneumatic (over/under thingie. maybe I should get around to posting it) and they said it was too big, it was a real weapon, eat moose with fishpaste, and stuff like that.
Also, to whoever said the average bore is growing smaller (was that joanna?) I think its because of all the mini whores that are now here.
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spanerman
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Thu Apr 05, 2007 11:33 am

no bow hunting in this country :shock: but i am a regular archer might be able to ask around my club to see if anyone has one. il get back to you on it :twisted:
leeeeshad
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Thu Apr 05, 2007 2:39 pm

do u find its quieter with loser fiting stuff like that bolt than eith sealed stuff like spuds?
chubster wrote:how do you saw the head off the nail?
spanerman
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Thu Apr 05, 2007 3:18 pm

i cant tell the difference tbh its loud all the time :P
spanerman
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Sat May 05, 2007 1:09 pm

UPDATE
Image testing(320psi)
Image

need to finish it off with a 1/4inch check valve and 3/4-1/2 bush hopfully will be nicer to use:)

What you think?
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spudthug
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Sun May 06, 2007 7:02 am

wow...and there is no way u tested it at 320 psi..that qev would have gone at 200..its rated to probably 145-160

ur gun is awesome..those compression fittings are pimp!!
4" piston valved cannon-half done..( i spilt my cement...)

Hybrid- 75% done. need to build propane holder and drill/tap sparkplug hole..
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