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 61 users online :: 3 registered, 0 hidden and 58 guests


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

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

The Team
Administrators
Global Moderators
global_moderators.png CS

Sprinkler vs. QEV

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

Unread postAuthor: skyjive » Fri Aug 22, 2008 3:34 pm

Thanks for all the responses guys, I appreciate the help. I guess I'll either try a QEV pilot or a modded blowgun.
  • 0

User avatar
skyjive
Master Sergeant
Master Sergeant
 
Posts: 163
Joined: Mon May 26, 2008 3:52 pm
Reputation: 0

Unread postAuthor: potatoflinger » Fri Aug 22, 2008 3:39 pm

skyjive wrote:Thanks for all the responses guys, I appreciate the help. I think I'm gonna try using a 1/4" QEV/blowgun as a pilot for the 3/4" QEV and see if that works (which it should, if results are proportional to cost and effort) :?

They are, this cannon that I made uses a blowgun to pilot a 3/4" QEV, and it has wonderful performance.
  • 0

It's hard to soar with eagles when you're working with turkeys.
User avatar
potatoflinger
Brigadier General
Brigadier General
 
Posts: 1136
Joined: Thu Nov 02, 2006 3:26 pm
Location: Maryland
Reputation: 1

Unread postAuthor: grumpy » Fri Aug 22, 2008 5:12 pm

ramses wrote:You can't fill from the chamber with a qev.


actualy you can and it is very easy to, all you do is take the diaghram or piston out of the qev and make a very small hole to pilot side. somewhere around here is a thread about it.
  • 0


grumpy
Captain
Captain
 
Posts: 331
Joined: Wed Sep 26, 2007 7:48 am
Location: tampa,fla.
Reputation: 0

Unread postAuthor: potatoflinger » Fri Aug 22, 2008 5:45 pm

grumpy wrote:
ramses wrote:You can't fill from the chamber with a qev.


actualy you can and it is very easy to, all you do is take the diaghram or piston out of the qev and make a very small hole to pilot side. somewhere around here is a thread about it.

But that would also decrease performance a little bit by slowing down the opening time.
  • 0

It's hard to soar with eagles when you're working with turkeys.
User avatar
potatoflinger
Brigadier General
Brigadier General
 
Posts: 1136
Joined: Thu Nov 02, 2006 3:26 pm
Location: Maryland
Reputation: 1

Unread postAuthor: skyjive » Sat Aug 23, 2008 5:12 pm

Alright, so my trouble apparently stemmed from a classic noob error, I forgot to unscrew the nozzle on the blowgun that reduces flow diameter to a pinhole. This combined with a redesign of the pilot/fill setup to reduce pilot volume resulted in success, finally. I did a controlled experiment using two identical guns, one with a sprinkler valve and one with a 3/4" QEV with blowgun pilot. The QEV shot roughly twice as far at 70 psi.
  • 0

User avatar
skyjive
Master Sergeant
Master Sergeant
 
Posts: 163
Joined: Mon May 26, 2008 3:52 pm
Reputation: 0

Previous

Return to Pneumatic Cannon Discussion

Who is online

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

cron
Reputation System ©'