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my second 6mm. custom QEV sniper airgun updated

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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Re: my second 6mm. custom QEV sniper airgum

Unread postAuthor: jackssmirkingrevenge » Sun Nov 03, 2013 6:05 am

Blow forward valves add dead space and rob energy from the projectile, especially if not made to very tight tolerances.

Consider a simple tee magazine with a detent:

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Re: my second 6mm. custom QEV sniper airgum

Unread postAuthor: 1nxtmonster » Sun Nov 03, 2013 8:47 am

For my tee detent I drilled two holes in the tee and then inserted a zip-tie for a detent.
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Re: my second 6mm. custom QEV sniper airgum

Unread postAuthor: bladeul2006 » Mon Nov 04, 2013 8:49 am

thanks "Talk"for the ideea but youre wrong, absolutely no air passes through the magazine hole because the push-forward piston directs the gaz beyond the magazine hole as I fire the gun, the problem is the piston (as the gas travels through the piston, pushing it forward, it looses velocity -> lowers FPS) I'l try to increase the gas flow through the piston and manufacture a much softer retuning spring

sorry but my english is not that good what is a "detent" ?? maby a picture of it ...
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Last edited by jrrdw on Thu Nov 07, 2013 12:55 pm, edited 1 time in total.
Reason: Double post.
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Re: my second 6mm. custom QEV sniper airgum

Unread postAuthor: jackssmirkingrevenge » Mon Nov 04, 2013 12:55 pm

detent, something which stops the BB from rolling out of the barrel.

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Re: my second 6mm. custom QEV sniper airgum

Unread postAuthor: dart guy » Mon Nov 04, 2013 4:14 pm

Jsr it looks like it will act like a hop up, if the projectile is round.
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Re: my second 6mm. custom QEV sniper airgum

Unread postAuthor: jackssmirkingrevenge » Tue Nov 05, 2013 4:45 am

Neat huh :)
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Re: my second 6mm. custom QEV sniper airgum

Unread postAuthor: bladeul2006 » Tue Nov 05, 2013 5:09 am

nice, thanks, looks good
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Re: my second 6mm. custom QEV sniper airgum

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Re: my second 6mm. custom QEV sniper airgum

Unread postAuthor: bladeul2006 » Wed Nov 06, 2013 12:23 pm

so I went to the country and I had some target shots from 15 meters, my scope was off a little bit because I had to asemble the gun on site. hope you like it

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Last edited by jrrdw on Thu Nov 07, 2013 6:48 am, edited 1 time in total.
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Re: my second 6mm. custom QEV sniper airgum

Unread postAuthor: bladeul2006 » Fri Feb 07, 2014 2:11 am

hy there, so I took your advice and made a detent loading mech, I think it achived semi, but I tested it on a lower gas pressure, because my co2 tank was nearly empty. Anyway, here are some pics, video will come when I'll carge my co2 tank.
It still needs some finishing.
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Re: my second 6mm. custom QEV sniper airgum

Unread postAuthor: bladeul2006 » Fri Feb 07, 2014 2:23 am

more pics ...




hopefuly some advices
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Re: my second 6mm. custom QEV sniper airgum

Unread postAuthor: bravootome » Fri Feb 07, 2014 4:57 am

r.
Tell me where from did you brought the pipe for barrel, If it is a cooper pipe if must know it's diam is 6,3.. not 6.
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Last edited by bravootome on Wed Dec 16, 2015 11:03 am, edited 1 time in total.
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Re: my second 6mm. custom QEV sniper airgum

Unread postAuthor: bladeul2006 » Fri Feb 07, 2014 6:06 am

what you meassured was in inches, meaning 1/4" you must search the pipe in metric units. (I work with this king of pipes, don't realy know where you can buy it, especialy in small quantities)
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Re: my second 6mm. custom QEV sniper airgum

Unread postAuthor: bladeul2006 » Sat Feb 08, 2014 2:16 pm

do you think this concept will perform better than my current one on regulated 30 bar pressure ?
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Re: my second 6mm. custom QEV sniper airgum

Unread postAuthor: jackssmirkingrevenge » Sun Feb 09, 2014 9:50 am

I don't think a hammer valve will give you more power unless you make one with exceptionally good flow struck by a decent hammer. What a hammer valve will allow you to do is tune the air usage to maximize number of shots per tank.
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Re: my second 6mm. custom QEV sniper airgum

Unread postAuthor: bladeul2006 » Sun Mar 09, 2014 11:24 am

Hy there, it's been a while, since I worked on my BLD3 hammer-valve project.
I replaced my steel qev piston with a plastic one, much more light than the previous one, with a better fit; also added a spring behind it.
overall I feel a much better performance than before(better BOOM sound), and also less gas lost with the pilot(thanks to bravotoome).
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