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My QEV copper 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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Unread postAuthor: chaos » 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.
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Unread postAuthor: spanerman » 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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Unread postAuthor: chaos » 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?
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Unread postAuthor: leeeeshad » Wed Apr 04, 2007 10:06 am

maby the big bolt next to it
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Unread postAuthor: spanerman » Wed Apr 04, 2007 10:20 am

^hes not wrong :P
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Unread postAuthor: chaos » 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.
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Unread postAuthor: spanerman » Thu Apr 05, 2007 3:51 am

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

that screw / bolt things scary! is it accurate?
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Unread postAuthor: spanerman » 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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Unread postAuthor: Flying_Salt » 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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Unread postAuthor: spanerman » 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:
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Unread postAuthor: leeeeshad » 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?
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Unread postAuthor: spanerman » Thu Apr 05, 2007 3:18 pm

i cant tell the difference tbh its loud all the time :P
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Unread postAuthor: spanerman » 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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Unread postAuthor: spudthug » 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!!
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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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