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.50" QEV gun *New stock, almost finished*

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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.50" QEV gun *New stock, almost finished*

Unread postAuthor: zy » Fri Jul 23, 2010 9:44 am

Just dropping by to inspire fellow spudders with this newly built QEV gun.
Hope you will enjoy it.

Info

1/2" QEV.
Pilot valve: modified blowgun (original didn`t take pressure over ~10 bar, and too low airflow).
.50" barrel, 57cm long (22 inch).
Wooden stock with adjustable length.
Scope is a cheap 3~9X40 GD from Dealextreme.
Pump: fork-pump that can handle 450psi/31bar.
Operating pressure: I actually dont know myself because the manometer on the fork-pump is somewhat... bad. When my compressor shows 9 bar, this show about 5 bar :? . But I take it too ~10 bar, so maybe 15 bar`ich?
It is probably calibrated to show accurate measurements @ 30 bar.


The gun is easily taken apart without tools for transportation etc.

Next project will be a semi-auto bullpup design with a 1/2" T-valve actuated by a electromagnet (coil + magnetic piston). But it will probably take a while to build, if I ever complete it... Well, that is another story.



Peace :)
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Attachments
gun10117.JPG
gun10117withsilencer.JPG
With silencer
easily taken apart.JPG
In pieces
ergonomic.JPG
Fits like a glove
paper+nail darts.JPG
Test with darts made of nails and paper @ 9 bar (true 9 bar :P ). Wood is 3.5cm (1,4 inch) thick.
9 bar.JPG
Test with darts made of nails and paper @ 9 bar (true 9 bar :P ). Wood is 3.5cm (1,4 inch) thick.
sleeved.JPG
God dammit... Sleeved it, just need some paint!
new stock almost fin.JPG
Almost finished, did this one in a hurry. The rear of the stock feels kind of... naked (and fat :S ), and needs to be remade. The grip also need some grip-tape. And of course, the sleeve need some paint too. Buuuuut, this gun is so darn fun to shoot with so I dont have time to do these adjustments :) .
Last edited by zy on Mon Aug 02, 2010 1:24 am, edited 3 times in total.

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Unread postAuthor: jackssmirkingrevenge » Fri Jul 23, 2010 9:48 am

Very nicely put together, in a quaint sort of way :) must take a bit of effort to get it up to pressure though as the chamber seems relatively large, you would have been better off with a smaller chamber and higher pressure.

The stock is particularly well finished, what wood is it?
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Unread postAuthor: Lockednloaded » Fri Jul 23, 2010 9:48 am

that stock is amazing, but the gun looks kind of dangly next to it. I recommend a wooden support
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Unread postAuthor: jackssmirkingrevenge » Fri Jul 23, 2010 9:51 am

You might want to try sleeving the barrel as suggested here, it would look less skinny plus you'd have the benefit of an integral silencer ;)
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Unread postAuthor: zy » Fri Jul 23, 2010 9:52 am

jackssmirkingrevenge wrote:Very nicely put together, in a quaint sort of way :) must take a bit of effort to get it up to pressure though as the chamber seems relatively large, you would have been better off with a smaller chamber and higher pressure.

The stock is particularly well finished, what wood is it?



Aaa forget, the chamber is about 110cc. Yeah it take 200 pumps to ~15 bar (bad manometer...). The problem is that I am a coward, the QEV`s max pressure is 12 bar, and I have no idea how much punishment it can take... So I am on the safe side ;).
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Unread postAuthor: zy » Fri Jul 23, 2010 9:53 am

Lockednloaded wrote:that stock is amazing, but the gun looks kind of dangly next to it. I recommend a wooden support


It is actually very stable :)
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Unread postAuthor: zy » Fri Jul 23, 2010 9:56 am

jackssmirkingrevenge wrote:You might want to try sleeving the barrel as suggested here, it would look less skinny plus you'd have the benefit of an integral silencer ;)


Hehe yeah, maybe I do, someday. But Im satisfied with the looks, or, I dont care so much for the looks. as long as it works, Im fine hehe.
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Unread postAuthor: spudtyrrant » Fri Jul 23, 2010 10:04 am

zy wrote: The problem is that I am a coward, the QEV`s max pressure is 12 bar, and I have no idea how much punishment it can take... So I am on the safe side ;).
i personally have taken them to 30 bar, some people on this forum have taken them as far as 60 bar, multiple times without failure :wink:
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Unread postAuthor: c11man » Fri Jul 23, 2010 10:14 am

ive been to 45, who takes theres to 60?
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Unread postAuthor: zy » Fri Jul 23, 2010 10:14 am

spudtyrrant wrote:
zy wrote: The problem is that I am a coward, the QEV`s max pressure is 12 bar, and I have no idea how much punishment it can take... So I am on the safe side ;).
i personally have taken them to 30 bar, some people on this forum have taken them as far as 60 bar, multiple times without failure :wink:


Oh... thats... sick.... :shock: . Well, maybe 20 bar wouldnt be so bad?
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Unread postAuthor: zy » Fri Jul 23, 2010 10:16 am

jackssmirkingrevenge wrote:You might want to try sleeving the barrel as suggested here, it would look less skinny plus you'd have the benefit of an integral silencer ;)


God dammit now Im sleeving it :P... Had some pvc-pipe laying around, but Im out of paint so it will look shitty until I get some new paint.
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Unread postAuthor: spudtyrrant » Fri Jul 23, 2010 1:35 pm

c11man wrote:ive been to 45, who takes theres to 60?
jeepkahn in the decimator, and maggotman(not the best example lol)
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Unread postAuthor: jackssmirkingrevenge » Fri Jul 23, 2010 5:43 pm

zy wrote:Gosh darnit now Im sleeving it :P


If you're going to increase the pressure, you'll need the extra suppression ;)
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Unread postAuthor: jakethebeast » Fri Jul 23, 2010 5:48 pm

hey that looks cool


this is offtopic but i just dont want to make a new topic out of this: if i had a barrel sealing piston valve with spring behind the piston, would it be semi-automatic if i pilot it with small qev? if so, do the small qev need to have a spring?
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Unread postAuthor: jackssmirkingrevenge » Fri Jul 23, 2010 5:50 pm

jakethebeast wrote:if i had a barrel sealing piston valve with spring behind the piston, would it be semi-automatic if i pilot it with small qev?


yes

if so, do the small qev need to have a spring?


no
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