Login    Register
User Information
Username:
Password:
We are a free and open
community, all are welcome.
Click here to Register
Sponsored
Who is online

In total there are 36 users online :: 4 registered, 0 hidden and 32 guests


Most users ever online was 218 on Wed Dec 07, 2016 6:58 pm

Registered users: Bing [Bot], Google [Bot], MSNbot Media, Yahoo [Bot] based on users active over the past 5 minutes

The Team
Administrators
Global Moderators
global_moderators.png CS

Semi-Auto* .22 QEV + Slide Valve Rifle WIP (*Almost)

Built a pneumatic cannon? Then post it here! This section is for completed, finished cannons that you have built. Please include pictures and information.
Sponsored 
  • Author
    Message

Semi-Auto* .22 QEV + Slide Valve Rifle WIP (*Almost)

Unread postAuthor: qwerty » Mon Apr 09, 2012 7:14 am

Well, as promised, i built a .22 caliber semi auto rifle using a QEV and slide valve.
It's not fully finished-I'll put a scope on it at some point and i need to make either a bolt or blow forwrd bolt for true semi-auto
Specifications:
-Chamber is 22mm copper chaped into a stock with fittings.
-The pilot chamber is again just 22mm copper.
-Main valve is a 1/4 QEV with a 3/8 exhaust (I have 6 of them :) )
-The pilot is a 1/4 Slide valve from eBay.
-Barrel is 5.6mm aluminium sleeved in 15mm copper, perfect for .22 pellets.

That's about it really, i've tested it at only 150psi so far and i get about 4 or 5 good shots with pellets before the power drops.
The accuracy isn't great either as my sights are just glued on and are way off.
I'll post a shooting video with some damage on Youtube later but here are some pictures and a quick video dry-fireing at 150 psi.

Image

Image

Image

Image

I need to get a good track pump as it takes a good 5 minutes to get to 150 psi with a shock pump.

Enjoy. :)
  • 0

I visit occasionally to make unrelated posts.
User avatar
qwerty
Colonel
Colonel
 
Posts: 677
Joined: Sun Apr 12, 2009 2:16 am
Location: Evesham, Worcs
Country: United Kingdom (uk)
Reputation: 0

Unread postAuthor: wyz2285 » Mon Apr 09, 2012 7:24 am

Very cool :o Is the trigger difficult to pull? My was when I tried to put a spring on it so it closes automatically...
  • 0

CpTn_lAw wrote::D "yay, me wanna make big multishot pnoob with 1000 psi foot pump compressor using diamond as main material. Do you think wet bread make good sealant? " :D
User avatar
wyz2285
Major General
Major General
 
Posts: 2244
Joined: Sat Mar 06, 2010 7:50 am
Location: Porto, Portugal
Country: Portugal (pt)
Reputation: 12

Unread postAuthor: Fexo180 » Mon Apr 09, 2012 7:28 am

i gotta gets me one of them slide valves :twisted:
nice build.. i like the shape of it.
  • 0

User avatar
Fexo180
Specialist
Specialist
 
Posts: 42
Joined: Wed Oct 26, 2011 8:07 am
Location: Australia
Reputation: 0

Unread postAuthor: qwerty » Mon Apr 09, 2012 7:38 am

Thanks, the trigger is quite hard to pull but i don't mind, It needs to be quite tough for the slide to return fast enough and avoid air loss.
  • 0

I visit occasionally to make unrelated posts.
User avatar
qwerty
Colonel
Colonel
 
Posts: 677
Joined: Sun Apr 12, 2009 2:16 am
Location: Evesham, Worcs
Country: United Kingdom (uk)
Reputation: 0

Unread postAuthor: i-will » Tue Apr 10, 2012 10:53 pm

I like it. Portable.
  • 0

WHY PAY FOR IT WHEN U CAN MAKE IT?
User avatar
i-will
2nd Lieutenant
2nd Lieutenant
 
Posts: 245
Joined: Tue Jul 22, 2008 3:04 am
Reputation: 0

Unread postAuthor: qwerty » Wed Apr 11, 2012 4:50 am

Mhm, it is :) Suprisingly light too. I might make a blow-forward bolt today for BBs as with pellets the performance isn't that great because of the small chamber and low pressures.
  • 0

I visit occasionally to make unrelated posts.
User avatar
qwerty
Colonel
Colonel
 
Posts: 677
Joined: Sun Apr 12, 2009 2:16 am
Location: Evesham, Worcs
Country: United Kingdom (uk)
Reputation: 0

Unread postAuthor: beastmode986 » Sun Apr 15, 2012 3:45 pm

hows the velocity?
  • 0


beastmode986
Master Sergeant
Master Sergeant
 
Posts: 170
Joined: Sat Mar 03, 2012 11:13 am
Reputation: 0

Sponsored

Sponsor
 


Unread postAuthor: jackssmirkingrevenge » Sun Apr 15, 2012 5:18 pm

beastmode986 wrote:hows the velocity?


From my own experiments with a similar setup:

In response to some questions about the sort of power available to this setup, I hooked up a 12 inch 6mm barrel and did some chrony testing at 120 psi. The firing chamber volume is around 3.5 cubic inches, a little wasteful but that's what I had ;)

Using 0.25g airsoft BBs, I got an average velocity of 590 fps, more than enough to punch through a soup tin. With some adapted 1 gram 0.22" pellets I got an average of 355 feet per second, fairly decent.


As always, for small bores you need higher pressures than what your average compressor can put out for decent (adult airgun range) power.

Also, qwerty, shouldn't your sig be "a dyslexic man walks into a bra"?
  • 0

User avatar
jackssmirkingrevenge
Donating Member
Donating Member
 
Posts: 24225
Joined: Thu Mar 15, 2007 11:28 pm
Country: Holy See (Vatican City State) (va)
Reputation: 66

Unread postAuthor: qwerty » Mon Apr 16, 2012 1:50 am

Also, qwerty, shouldn't your sig be "a dyslexic man walks into a bra"?


I pondered on this for a while... Surely dyslexic people would be able to read the letters in the right order but not be able to spell them?
I honestly don't know as i'm not dyslexic :roll:
  • 0

I visit occasionally to make unrelated posts.
User avatar
qwerty
Colonel
Colonel
 
Posts: 677
Joined: Sun Apr 12, 2009 2:16 am
Location: Evesham, Worcs
Country: United Kingdom (uk)
Reputation: 0

Return to Pneumatic Cannon Database

Who is online

Registered users: Bing [Bot], Google [Bot], MSNbot Media, Yahoo [Bot]

cron
Reputation System ©'