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full auto piston

This area is for the discussion of BB or airsoft sub machine guns, and or other small arms such as pellets.
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full auto piston

Unread postAuthor: Sticky_Tape » Thu Mar 13, 2008 3:35 pm

It says it all but it is a question has anybody made somthing like this?
wel I know of the qevs with a pop off but what about a co axial with a pop of?

EDIT: This what it would look like with a modified blow forward brech the whole barrel would move adding a cool effect nice!
Image[/url]
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untitled_724.jpg
It is a co axial.
untitled_724.jpg (15.6 KiB) Viewed 1687 times
untitled.JPG
This is the updated version number two
untitled.JPG (11.73 KiB) Viewed 1477 times
Last edited by Sticky_Tape on Wed Mar 19, 2008 1:11 pm, edited 2 times in total.
You can tell how awesome a cannon is by the pressure used.
http://www.spudfiles.com/forums/high-pr ... 12803.html
xnt rnm ne z ahtbg
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Unread postAuthor: Rokmonkey » Thu Mar 13, 2008 3:41 pm

Hmm, looks legit, but I'd go with and over under piston in a T so you can actually have more than one shot, eh?
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Unread postAuthor: Hawkeye » Thu Mar 13, 2008 3:41 pm

Yes, that design has been beaten to death on here. BTB's Marble Machine gun works on a similar principle with a custom pop-off.
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Unread postAuthor: Sticky_Tape » Thu Mar 13, 2008 4:00 pm

you could get more than 1 shot in this and I just did somthing up on ms paint
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You can tell how awesome a cannon is by the pressure used.
http://www.spudfiles.com/forums/high-pr ... 12803.html
xnt rnm ne z ahtbg
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Unread postAuthor: Monkey621 » Thu Mar 13, 2008 4:48 pm

That looks exactly like something JSR made/is experimenting with.
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Unread postAuthor: psycix » Thu Mar 13, 2008 4:50 pm

Well, it may look simple to build a coacial loading like that but in 2D paint drawing its way easyer than in 3D reality.
Do mind that you will have to get the ammo pipe through the wall of the larger bore chamber pipe. Wich would only be accomplised well with a T on the chamber.
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Unread postAuthor: bigbob12345 » Thu Mar 13, 2008 5:31 pm

I actually am working on something almost exactly like that.
the only differnc is mine is in a tee valve and not coax. Ive been kinda neglecting it lately but ill try to finish it this weekend as I have always dreamed of semi/full auto.
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Unread postAuthor: jackssmirkingrevenge » Thu Mar 13, 2008 6:30 pm

It would work if you balance your flows, it's exactly the same principle as this one.

Instead of moving the whole barrel, why not incorporate a bolt into the piston, as had been proposed here?

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Unread postAuthor: VH_man » Thu Mar 13, 2008 10:49 pm

JSR, i beleive someone made a semi-auto marblegun using that method.......... I remember it distinctly becuase the poor kids fittings looked like they survived a 3 alarm fire. it worked great though.........
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Unread postAuthor: elitesniper » Thu Mar 13, 2008 10:59 pm

I believe markfh11q was the one who made a semi auto with a qev and a popoff?
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Unread postAuthor: Hawkeye » Thu Mar 13, 2008 11:00 pm

The problem I find is that the air resetting the piston causes just enough blow-by past the piston that enough hisses out the barrel and actually weakly pushes the ammo out.
You see that if you load a piston gun and then try to pump it up. The piston tends to not seal quickly enough.
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Unread postAuthor: elitesniper » Thu Mar 13, 2008 11:01 pm

Not if you have a tight fitting piston :wink:
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Unread postAuthor: Hubb » Fri Mar 14, 2008 1:07 am

...or a high pressured air source.

If all of that is worked out, then you can end up with something like this.
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Unread postAuthor: Sticky_Tape » Tue Mar 18, 2008 2:44 pm

I made a EDIT. /\
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You can tell how awesome a cannon is by the pressure used.
http://www.spudfiles.com/forums/high-pr ... 12803.html
xnt rnm ne z ahtbg
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Unread postAuthor: Sticky_Tape » Wed Mar 19, 2008 1:13 pm

/\I made a updated look up /\ that version would have a sealing face that seals the pop off when the piston is piloted this alows the pop off to close so that the piston can move forward.
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You can tell how awesome a cannon is by the pressure used.
http://www.spudfiles.com/forums/high-pr ... 12803.html
xnt rnm ne z ahtbg
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