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.22 QEV Air Rifle

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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.22 QEV Air Rifle

Unread postAuthor: qwerty » Thu Aug 05, 2010 10:06 am

Just a quick mashup of random unused parts. Basicly it's a 1/2 QEV piloted with a 1/4 blowgun, chamber is 22mm copper and the barrel is 6mm alluminium sleeved inside 15mm copper piping
The shot done was at around 100 psi and i have yet to crank up the pressure.

Unfortunatly there is only a video because photobucket dosen't accept pictures from my camcorder.




[youtube]http://www.youtube.com/watch?v=gCwkCEJ38k4[/youtube]


The pellets are modified slightly so that the fit the 6mm barrel perfectly.
Velocity? i don't realy know but i'm guessing somewhere in the high 400s low 500s.

Hmmm, 300psi anyone?
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Unread postAuthor: jackssmirkingrevenge » Thu Aug 05, 2010 10:30 am

Looks good, and yes you need to crank up the pressure :)

Given the fact that you're using barracuda heavies, I would say velocity is more likely in the 200-300 fps range.
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Unread postAuthor: qwerty » Thu Aug 05, 2010 11:14 am

Nah, much higher than that, i can tell just by shooting it into the air. Maybe 490 then.
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Unread postAuthor: jackssmirkingrevenge » Thu Aug 05, 2010 11:17 am

qwerty wrote:i can tell just by shooting it into the air.


Who needs a chronograph eh?

My 14 ft/lbs Air Arms S410 could only do 300 fps tops with heavy pellets, and that's from a 3,000 psi fill...
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Unread postAuthor: qwerty » Thu Aug 05, 2010 11:23 am

Who needs a chronograph eh?

My 14 ft/lbs Air Arms S410 could only do 300 fps tops with heavy pellets, and that's from a 3,000 psi fill...


Not me.... nah but i can see it shoot of into the distance and it's much faster comparing it my cheapo airsoft pistol (200fps with .12g bbs)

And 300 fps? Seriously? TBH thats terrible but i suppose hammer valve guns realease a short burst of air and are designed to shoot lighweight target pellets.

And please don't show me a link of the Airforce Condor...

Just ordered a tin of 13.3g bisley target pellets.
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Unread postAuthor: jackssmirkingrevenge » Thu Aug 05, 2010 11:33 am

qwerty wrote:Not me.... nah but i can see it shoot of into the distance and it's much faster comparing it my cheapo airsoft pistol (200fps with .12g bbs)


Your 0.12g BBs have a horrible ballistic coefficient compared to heavy pellets, so really what you're seeing is that your pellets *slow down* much quicker than the BBs. If you can see the pellet, it's clearly not moving that fast anyway ;)
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Unread postAuthor: qwerty » Thu Aug 05, 2010 11:37 am

If you can see the pellet, it's clearly not moving that fast anyway


Not neccasserily(SP?) looking right down the barrel you can see things going actually quite fast.
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Unread postAuthor: jackssmirkingrevenge » Thu Aug 05, 2010 11:38 am

Fair enough, I could see 0.22" pellets at 550 fps on a sunny day down the scope, but anyway without chrony results this discussion is moot.
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Unread postAuthor: qwerty » Thu Aug 05, 2010 11:41 am

Ok, lets end about this fps thing....... 500 fps +-50fps
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Unread postAuthor: jackssmirkingrevenge » Thu Aug 05, 2010 11:43 am

How about "I have absolutely no idea what velocity my projectiles are travelling at, and without actual chronograph results any figures I give are pure speculation" ;)
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Unread postAuthor: qwerty » Thu Aug 05, 2010 11:44 am

Fine..... :oops: :x
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Unread postAuthor: jackssmirkingrevenge » Thu Aug 05, 2010 11:46 am

Tell you what - shoot at a soup tin, see what penetration you get. I have the same pellets, we can do a comparative test in terms of penetration, and see how it relates to velocity ;)
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Unread postAuthor: qwerty » Thu Aug 05, 2010 11:55 am

Done that. Straight through.
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Unread postAuthor: jackssmirkingrevenge » Thu Aug 05, 2010 12:15 pm

Steel soup tin, not aluminium soda can, right?

As soon as I have batteries for my chrony I'll let you know ;)
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Unread postAuthor: qwerty » Thu Aug 05, 2010 12:46 pm

yep steel thai coconut milk can. exactly the same as soup cans.
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