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| skyjive |
 Posted: 08/22/2008 14:34 PM Post subject: |
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Specialist
Joined: 26 May 2008
Posts: 44
171.00 Spud Bux
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| Thanks for all the responses guys, I appreciate the help. I guess I'll either try a QEV pilot or a modded blowgun. |
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| potatoflinger |
| Posted: 08/22/2008 14:39 PM Post subject: |
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Seasoned Spudder
Joined: 02 Nov 2006
Posts: 999
368.61 Spud Bux
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| 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. |
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| grumpy |
| Posted: 08/22/2008 16:12 PM Post subject: |
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1st Lieutenant
Joined: 26 Sep 2007
Posts: 299
369.96 Spud Bux
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| 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. |
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| potatoflinger |
| Posted: 08/22/2008 16:45 PM Post subject: |
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Seasoned Spudder
Joined: 02 Nov 2006
Posts: 999
368.61 Spud Bux
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| 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. |
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| skyjive |
| Posted: 08/23/2008 16:12 PM Post subject: |
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Specialist
Joined: 26 May 2008
Posts: 44
171.00 Spud Bux
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| 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. |
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