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Vehicle mounted antitank "gun" with preloaded cart

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: Larda » Sat Jul 21, 2012 9:01 am

No, but with a burstdisk it goes of with a bang. :D
I actually did try to pilot it with the schrader, and without the valve core in place and it almost worked fine.

The barrel is 43mm, so its perfect for golfballs, maybe i should bring it to the driving range for test shooting? :D
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Unread postAuthor: jackssmirkingrevenge » Sat Jul 21, 2012 9:13 am

With a floating o-ring it would have worked with the schrader :) but if you're using burst disks it clearly isn't necessary.
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Unread postAuthor: killerbanjo » Sat Jul 21, 2012 7:46 pm

Cant wait to see the finished product... These are really sexy!
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Unread postAuthor: Fnord » Sat Jul 21, 2012 10:15 pm

Ack! missed this the first time around rainbowdroolraptor.jpg

Yes larda, do not waste this merely on wimpy airsoft bbs. High pressure tests must also be done.



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Unread postAuthor: iknowmy3tables » Sat Jul 21, 2012 10:34 pm

this is very cool, I remember jack had a design a lot like this that he wanted to make but never had the facilities.

I've got a new job that has a machine shop and I was wondering how you get those flush threads non-NPT style threads needed to squeeze the burst disk, all the taps and dies I've ever seen are tapered so to get complete threads you'd need to pass all threaded sections past the tapered sections. did that make sense?
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Unread postAuthor: Larda » Sun Jul 22, 2012 5:45 am

I am cutting the threads with the lathe, so then i can get a good thread almost all the way.
And if you lock at the plug you can see that the first few millimeter is turned to a slightly smaller diameter.
To seal against the burstdisk i have counterbore at the bottom with a rubber/metal washer.
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Unread postAuthor: jackssmirkingrevenge » Sun Jul 22, 2012 5:50 am

iknowmy3tables wrote:this is very cool, I remember jack had a design a lot like this that he wanted to make but never had the facilities.


I have since discovered hybrids though ;)
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Unread postAuthor: Larda » Sun Jul 22, 2012 8:18 am

One interesting thing with this cartridges is that i am right now not using any rubber sealing between the barrel and the piston, its just POM-C Acetal plastic against metal.
And still the cartridge seems to hold the pressure,but i haven't tested it for a longer period of time, just a few hours at most.
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Unread postAuthor: Live1nce » Tue Jul 31, 2012 12:19 am

This is great! I cant wait to see this things completed! I really hope you invest some time when its all done into some nice video footage! This thing will be a beaut!
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Unread postAuthor: Gun Freak » Tue Jul 31, 2012 8:45 am

Good Lord Larda, you've done it again :D
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Unread postAuthor: Labtecpower » Tue Jul 31, 2012 1:45 pm

Very very nice, fapworthy to say the least :D
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Unread postAuthor: GonzoInferno » Mon Nov 05, 2012 12:02 pm

I am working on similar project. Are you doing the machining yourself?
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Unread postAuthor: SkillessNoob » Mon Nov 05, 2012 12:15 pm

This project makes me happy inside. :)
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