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QEV+popoff experiment - update: NOW WITH AMMO!

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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Unread postAuthor: Brian the brain » Mon Mar 30, 2009 5:40 pm

One little question, hwo exactly is the QEV piloted? I see how the pop of valves work but i dotn understand how the QEV is piloted and how it improves anything i.e. wouldnt this work better with a coax and the pop of at the end of the barrel?


Jeezz...he was pretty clear on the subject.

Let me try:

http://www.youtube.com/watch?v=iq4loVzocHs
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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!!
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Unread postAuthor: jwilson7 » Mon Mar 30, 2009 5:42 pm

Sweet QEV! Can't wait to see damage vid/pics!
:wav:
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Unread postAuthor: psycix » Mon Mar 30, 2009 5:53 pm

Thanks! I'm glad you guys like it :)

Brian the brain wrote:I just rewatched it...I was smiling from one ear to the other :D
So am I every time I twist open that valve. :D

Davidvaini wrote:EDIT: I'm downloading audacity to figure out the ROF with that fire extinguisher.
I have a little surprise for you: That ROF wasnt max ROF. The valve was about half open and the tank was on about half the max pressure.
Though at some point the valve will go farting instead of making true cycles.

john bunsenburner wrote:One little question, hwo exactly is the QEV piloted? I see how the pop of valves work but i dotn understand how the QEV is piloted and how it improves anything i.e. wouldnt this work better with a coax and the pop of at the end of the barrel?
I explained it in the video, but I'll explain again for you:
Air goes into gun -> pressure goes up
Pressure goes above popping pressure -> popoff valve opens
Popoff valve vents air to the atmosphere (fast!), pilotting the QEV -> QEV fires
Pressure drops -> popoff closes
gun gets refilled

POLAND_SPUD wrote:I hope you realize that implementing a blowforward bolt is going to be a pain in the ass.. you might try my vertibolt design (if you don't mind buying an air cylinder and if it will work here) or just find a way to minimize flow restrictions cased by the bolt
Access to a machine shop. I has dat too. ;)

----------------------------------------

Oh and you guys should see that vapor cloud when going full auto from the fire extinguisher (the FE is now called tnak btw). I will pay special attention to that when recording the video tomorrow.
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Unread postAuthor: Gippeto » Mon Mar 30, 2009 7:02 pm

That looks like it'll be ... fun...to play with. :twisted:
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Unread postAuthor: starman » Mon Mar 30, 2009 7:27 pm

Really great experiment and presentation psycix. That's simple to implement, but yet very effective.

Now the blow forward loader.... :wink:
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Unread postAuthor: jackssmirkingrevenge » Mon Mar 30, 2009 11:21 pm

Holy crap dude!


Looking very good, good luck with getting the blow-forward to work, I'm sure you'll manage it.

Dakka dakka FTW!

Personally, I still think this is a better idea in terms of efficiency, but you have a fridge compressor, what do you care :D
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Unread postAuthor: psycix » Tue Mar 31, 2009 6:23 am

NEW VIDEO!
I just woke up my brother with it..... :twisted:
Click to watch!
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Unread postAuthor: jackssmirkingrevenge » Tue Mar 31, 2009 7:56 am

haha, you enjoyed that a bit too much :)

Dammit, you can't steal my pop-off thunder, I'm remaking that bloody valve as soon as I get home :P :D
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Unread postAuthor: Brian the brain » Tue Mar 31, 2009 1:29 pm

Funniest video in quite a while!!!

You are a bit of a sadist though.... :shock:

I wonder if just shooting air at a living person would be against the rules..

If so...you just broke them....well....about...200 times?? :wink:


If you try and beat this again JSR,... :idea: I'll join forces with Psy and we'll put his exhaust system on Porter...

And then we'll really scare his brother.... :D
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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!!
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Unread postAuthor: jackssmirkingrevenge » Tue Mar 31, 2009 1:53 pm

Brian the brain wrote:If you try and beat this again JSR...


Working on a new pop-off as we speak, with some changes, smaller chamber porting and piston and coil as opposed to air spring.
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Unread postAuthor: psycix » Tue Mar 31, 2009 2:08 pm

3rd video online!
Clicky clicky!

This time I show how long it can run on the FE tnak. (<- no typo :lol:)
Also the maximum ROF is tested out.


BTB wrote:I wonder if just shooting air at a living person would be against the rules..
Naahhh, its just a pneumatic noisemaker.
Besides he was more dead then alive until I came in anyway.

BTB wrote:I'll join forces with Psy and we'll put his exhaust system on Porter...
We'd need a few tnakvlagwraggels for that.

BTB wrote:And then we'll really scare his brother....
I think that thats just the definition of heart attack.
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Unread postAuthor: sniper hero » Tue Mar 31, 2009 3:29 pm

SWEET!
I love the sound and need to try this :D
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Unread postAuthor: Brian the brain » Tue Mar 31, 2009 3:50 pm

I've got plenty tnakwragleggeldragwaggels over here

( just playing, we made a lot of incomprehencable typo's on messenger yesterday)


The qev+ pop-off thing has been done a few times before....but the mayor improvement comes from the 30 bars of free air stored in that
TNAK...( the tanks' name)

I wish I had never sold it to you!! :D
No I don't..you've given SF something for their money now!
You've certainly gone up a few ranks now.
I dub thee: Dutch Spud Clan Psycho...

That r.o.f is in-freaking-sane!!!!!
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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!!
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Unread postAuthor: psycix » Tue Mar 31, 2009 3:58 pm

I honestly never expected this to become such a succes.
It was more like: "ahh just for the heck of it I'm going to try it."



Can anyone use audacity or something like that to determine the ROF?
Davidvaini mentioned this.
Also it would be awesome if someone could count the number of shots in the endurance test. :roll:
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Unread postAuthor: Brian the brain » Tue Mar 31, 2009 4:23 pm

How many shots would a QEV last sir??


Well...quite a lot .. listen to this ...

Klerk pulls out this contraption........:D


This certainly prooves the durability of these things!
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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!!
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