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constant flow full auto :)

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.
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Unread postAuthor: POLAND_SPUD » Sat Nov 07, 2009 1:54 pm

I don't think a vehicle mounted autocannon would be consistent with keeping a low profile

well but that would be cool wouldn't it ?? :D

first of all, you would need quite a lot of compressed air for this project... a car engine can provide enough HPs to power even a large air compressor

and I remember that you've mentioned that you don't have enough space to test larger guns... so with an on board air compressor you could drive to some remote part of XXXXXXXXXXXXX and test them there

what is more, you could mod the compressor to acheive higher pressures with it
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Unread postAuthor: jackssmirkingrevenge » Sun Nov 08, 2009 10:08 am

The coolness factor would certainly make it worthwhile :)

I was also considering buying a slightly bigger paintball bottle, feeding this thing 450 psi at a low rate should be a viable proposition because according to the markings on the valve it can be advusted to pop from 0 to 3 bar, 45 psi isn't much so large flow and bore are important.
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Unread postAuthor: Procyon » Tue Nov 10, 2009 6:40 pm

I like it.

What's the rating on your valve? When the 200 pops on my RPG everyone around jumps. I can definitely see good potential for a strong shooter with a 200 psi valve going off with 250 behind it. Nice thinking. I'll be joining those giving it a try. I would think you could also control rate of fire as well by adjusting input pressure. Great idea!
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Unread postAuthor: Solar » Tue Nov 10, 2009 7:34 pm

Polyconn will make ones for higher psis as well. They have larger port openings as well.
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Unread postAuthor: jackssmirkingrevenge » Wed Nov 11, 2009 1:28 am

Procyon wrote:What's the rating on your valve? When the 200 pops on my RPG everyone around jumps. I can definitely see good potential for a strong shooter with a 200 psi valve going off with 250 behind it. Nice thinking. I'll be joining those giving it a try. I would think you could also control rate of fire as well by adjusting input pressure. Great idea!


The body has PN16 stamped on it, so it will happily take 235 psi. The pop-off rating however is marked as 0-3 BAR, so that's around 45 psi maximum pop-off pressure.

The thing about using standard pop-offs it that they are not optimised for "full auto" operation, I determined that a succesful valve used in this manner needs the following criteria:

1) The piston seat must be significantly bigger than the outlet to the barrel, to ensure that the piston chamber fills with pressure faster than it can empty and the piston has time to actually pop

2) The piston must be significantly wider than the piston seat, in order for there to be enough area for the pressure to act on and overcome the spring strength.


The 1" valve is currently being modded to satisfy these conditions. I had ended up making my own pop-off with the above parameters in mind, take a look at version 1 and version 2

Hook it up to a barrel and magazine and it works :D

[youtube]http://www.youtube.com/watch?v=vXxLMcZWLYs[/youtube]

Polyconn will make ones for higher psis as well. They have larger port openings as well.


I had made an HPA version but given my limited construction facilities the porting is relatively tiny.
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