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 54 users online :: 5 registered, 0 hidden and 49 guests


Most users ever online was 155 on Mon Aug 15, 2016 1:40 am

Registered users: Bing [Bot], Google [Bot], Majestic-12 [Bot], MSNbot Media, Yahoo [Bot] based on users active over the past 5 minutes

The Team
Administrators
Global Moderators
global_moderators.png CS

Need assistance picking a qev and 3 way

Post questions and info about pneumatic (compressed gas) powered cannons here. This includes discussion about valves, pipe types, compressors, alternate gas setups, and anything else relevant.
Sponsored 
  • Author
    Message

Need assistance picking a qev and 3 way

Unread postAuthor: heavyengineering » Thu May 23, 2013 3:36 pm

Id like to put together a cannon to shoot nerf vertex rockets. primarily used to entertain the kids but id like to use it as a law rocket in paintball. 2" barrel ID iirc. I think ive got this figured out but i could use some help finding a qev and 3 way to fire this. Could someone point me in the right direction?
  • 0


heavyengineering
Private
Private
 
Posts: 5
Joined: Thu May 23, 2013 3:25 pm
Reputation: 0

Unread postAuthor: jackssmirkingrevenge » Thu May 23, 2013 3:40 pm

http://www.ebay.com/

Find as big a QEV as you can if you want good performance without resorting to high pressures.
  • 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: heavyengineering » Thu May 23, 2013 8:19 pm

im considering a 1/8" unit simply because its the right size fitting to make things super easier for me. would the pressure requirements be too great for the qev? would i have a hard time making 140fps?
  • 0


heavyengineering
Private
Private
 
Posts: 5
Joined: Thu May 23, 2013 3:25 pm
Reputation: 0

Unread postAuthor: PVC Arsenal 17 » Thu May 23, 2013 10:19 pm

heavyengineering wrote:im considering a 1/8" unit simply because its the right size fitting to make things super easier for me. would the pressure requirements be too great for the qev? would i have a hard time making 140fps?


Yes. An 1/8" QEV will be woefully inadequate. Size up and purchase bushings to connect with your other parts. Good luck
  • 0


PVC Arsenal 17
Major General
Major General
 
Posts: 1762
Joined: Mon Mar 27, 2006 4:18 pm
Location: United States
Reputation: 1

Unread postAuthor: jackssmirkingrevenge » Thu May 23, 2013 11:33 pm

He's right you know. You would need an insane amount of pressure to get 140 fps from such a small valve, and having that jet of air from a tiny nozzle would probably shred the projectile anyway.

You should be looking into something like a 1.5" or 2" sprinkler valve, they can still be filled and piloted by three way valves.
  • 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

Re: Need assistance picking a qev and 3 way

Unread postAuthor: dewey-1 » Fri May 24, 2013 6:13 am

heavyengineering wrote:Id like to put together a cannon to shoot nerf vertex rockets.


Here is one design you are welcome to use;
http://www.spudfiles.com/forums/asco-ne ... 17764.html

Here is another;
http://www.spudfiles.com/forums/comfy-c ... 11219.html
  • 0

User avatar
dewey-1
Major General
Major General
 
Posts: 1298
Joined: Wed Mar 28, 2007 10:24 am
Location: NE Wisconsin USA
Reputation: 0

Unread postAuthor: heavyengineering » Fri May 24, 2013 6:49 am

the sprinkler valves seem too big for a compact carryable design. is 1.5" the smallest practical size?

i can find 1/2" qev's easily enough, will that still be too small?
  • 0


heavyengineering
Private
Private
 
Posts: 5
Joined: Thu May 23, 2013 3:25 pm
Reputation: 0

Sponsored

Sponsor
 


Unread postAuthor: dewey-1 » Fri May 24, 2013 8:09 am

  • 0

User avatar
dewey-1
Major General
Major General
 
Posts: 1298
Joined: Wed Mar 28, 2007 10:24 am
Location: NE Wisconsin USA
Reputation: 0

Unread postAuthor: heavyengineering » Fri May 24, 2013 2:58 pm

i like that one, unfortunately it runs off propane. ill be using regulated air from a paintball tank.

ive see rigs using 12 gram co2, some pipe and a ball valve work. is that because the pressure is so high?

my alternative is to buy something purpose built like this http://www.metadyneindustries.com/produ ... -launcher/
  • 0


heavyengineering
Private
Private
 
Posts: 5
Joined: Thu May 23, 2013 3:25 pm
Reputation: 0

Unread postAuthor: PVC Arsenal 17 » Fri May 24, 2013 7:02 pm

heavyengineering wrote:my alternative is to buy something purpose built like this http://www.metadyneindustries.com/produ ... -launcher/


Don't waste your money. You can achieve the same thing for much less by building one yourself. If you want the HPA paintball tank feature, just buy a secondary regulator and use it in conjunction with a QEV.

It's been I while since I've played paintball, but I believe HPA tanks output either 400 or 800 psi. You'll want to lower that closer to 100 and then have the ability to make smaller adjustments to keep your velocity safe.
  • 0


PVC Arsenal 17
Major General
Major General
 
Posts: 1762
Joined: Mon Mar 27, 2006 4:18 pm
Location: United States
Reputation: 1

Unread postAuthor: heavyengineering » Sat May 25, 2013 2:19 pm

so my local menards has rainbird 1" sprinkler valves on the shelf. i think im going to make something similar to this (thanks dewey) Image

what can i use to adapt 1/2" x14 bsp to npt? is there something on the shelf i missed?
  • 0


heavyengineering
Private
Private
 
Posts: 5
Joined: Thu May 23, 2013 3:25 pm
Reputation: 0

Unread postAuthor: Brian the brain » Tue May 28, 2013 3:40 pm

1/2" bsp happens to be ..just about the same as the NPT-paintball size.

I can thread an aluminum 12gram quick change adapter into 1/2" bsp that is.
Tight fit, but it works.


I wouldn't recomment forking up the threads on your tank, but if you could find a male-female socket in npt you could sacrifice it and just thread it in.

That is, if you can't find a factory made adapter ofcourse...
  • 0

Gun Freak wrote:
Oh my friggin god stop being so awesome, that thing is pure kick ass. Most innovative and creative pneumatic that the files have ever come by!

Can't ask for a better compliment!!
User avatar
Brian the brain
Moderator
Moderator
 
Posts: 3494
Joined: Mon Dec 05, 2005 2:06 am
Location: Holland
Country: Netherlands (nl)
Reputation: 29

Return to Pneumatic Cannon Discussion

Who is online

Registered users: Bing [Bot], Google [Bot], Majestic-12 [Bot], MSNbot Media, Yahoo [Bot]

Reputation System ©'