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600 psi 3/4" QEV Launcher

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: Dave_424 » Tue Feb 03, 2009 7:12 pm

Cheers for the feedback, all credit to the bullpup design goes to hotwired.

Get ready for some more damage!!

Dave
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Unread postAuthor: far_cry » Tue Feb 03, 2009 9:49 pm

that is so crazy
i love it
so how much time to get 500 psi in yore gun by the fridge compressor ?
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Unread postAuthor: Dave_424 » Tue Feb 03, 2009 9:50 pm

cheers, 2-3 minutes
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Unread postAuthor: jackssmirkingrevenge » Wed Feb 04, 2009 12:29 am

frankrede wrote:I had a ricochet off the sidewalk from a co2 bb pistol shatter my sliding glass door. Its really ridiculous, cost me $300 to replace.


Shattering means relatively low velocity, it's when the projectile leaves neat round holes that you should really get worried.
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Unread postAuthor: far_cry » Wed Mar 25, 2009 10:35 pm

so is the blow gun can handle that high pressure
and can he manage to handle 1000 psi ?
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Unread postAuthor: jook13 » Thu Mar 26, 2009 12:42 am

Shattering means relatively low velocity, it's when the projectile leaves neat round holes that you should really get worried.


Shattering simply means that the glass was tempered. Certain windows require this feature. Where I live the code is any glass on a working door, any window within 24 inches of a door, or any window that goes lower than 18 inches from the ground needs to be tempered. These windows are designed to shatter into a million small pieces when pierced, rather than most windows that break into huge swords of death glass. Its a safety thing...

Yeah, I frame houses and install windows for a living...


As to this rifle, It is definately clean and nice looking. As many others have stated, your high pressures are pushing your luck a bit in my opinion. Still, I can appreciate the care you took to make it look nice and clean. Well done.
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Unread postAuthor: jackssmirkingrevenge » Thu Mar 26, 2009 12:57 am

jook13 wrote:Shattering simply means that the glass was tempered. Certain windows require this feature.


Say the Glass was untempered though, hit it with low velocity and the material will absorb the impact and crack substantially leaving a much bigger hole than the projectile. With high velocity though, the glass has no time to react and only the material immediately affected by the impact will be damaged leaving a projectile sized hole.

As to this rifle, It is definately clean and nice looking. As many others have stated, your high pressures are pushing your luck a bit in my opinion. Still, I can appreciate the care you took to make it look nice and clean.


Could use a nice wooden stock though eh? :wink: :D
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Last edited by jackssmirkingrevenge on Thu Mar 26, 2009 1:55 am, edited 1 time in total.
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Unread postAuthor: jook13 » Thu Mar 26, 2009 1:27 am

Ha! I think all guns would benefit from a wooden stock. I think I will build one for my 3 inch porting monster cannon. All I need is a redwood tree trunk. :P
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Unread postAuthor: Carlman » Thu Mar 26, 2009 1:45 am

jackssmirkingrevenge wrote:Say the class was untempered


what a good class!

Nice work mate! clean and simple is plenty
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Unread postAuthor: jackssmirkingrevenge » Thu Mar 26, 2009 1:54 am

Carlman wrote:what a good class!


lol!

wanker...

:roll: :D
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Unread postAuthor: rna_duelers » Thu Mar 26, 2009 2:08 am

HA,Told!

Nice gun,but how long do you expect the fridge compressor to live if you continually use it at 500psi?They aren't rated to those pressures.500psi in my opinion is a little to crazy,but if there's damage pictures and videos involved I won't refrain from watching :)
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Unread postAuthor: c11man » Thu Mar 26, 2009 7:41 am

i want to make a similar gun and i was wondering what qev did you use? also what pressures do you think the qev can handle?


btw AWSOME GUN!!!
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Unread postAuthor: jeepkahn » Thu Mar 26, 2009 8:17 am

What I'm interested in is how well the 3/4" qev is handling the pressures, the one in the picture is rated at 150psi with a 4:1 safety factor(according to alpha's website and specs)....

Sweet peashooter though...

on an efficiency note, wouldn't it be better to have the 90 on the chamber and not the barrel??? with the plumbed trigger you wouldn't change the overall layout...
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Unread postAuthor: c11man » Thu Mar 26, 2009 9:12 pm

also where did you get the qev? did you have to change anything to get it to handle 600psi?

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Sweet peashooter though...


peashooter? are you on drugs? this is an insanly high powered cannon dude
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Unread postAuthor: rna_duelers » Fri Mar 27, 2009 4:15 pm

I 2nd that notion,peashooter...Cmon.
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