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preloaded pneumatic cartridge

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: mopherman » Mon Jun 11, 2007 9:36 am

i had an idea similar to this a while back. I got stuck on the fireing mechanism though. best of luck!
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Unread postAuthor: jackssmirkingrevenge » Mon Jun 11, 2007 10:21 am

I've been wanting to make it for ages but I kept putting it off trying to find a simpler way to make the cartridges - now i realed all that time I wasted on R & D could have been spent making a design which involves a little work but whose functionality I can be reasonably sure of. I'm making the piston as we speak, should have a working cartridge by the end of the week :)
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Unread postAuthor: VH_man » Mon Jun 11, 2007 12:19 pm

you should make the piston get hit open by a hammer like the airsoft grenade shells. it might work better.... but then, your pengun project worked fine so........
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Unread postAuthor: jackssmirkingrevenge » Mon Jun 11, 2007 12:36 pm

VH_man wrote:you should make the piston get hit open by a hammer like the airsoft grenade shells. it might work better.... but then, your pengun project worked fine so........


It can't be more efficient than a piston valve that way... also, since the hammer only has to push open a schrader, it doesn't have to be so strong.
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Unread postAuthor: mopherman » Mon Jun 11, 2007 2:43 pm

think this would work?
no trigger yet
http://s9.photobucket.com/albums/a92/mo ... iagram.gif
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Unread postAuthor: pyromaniac » Mon Jun 11, 2007 4:46 pm

Mopher did you make that if so photo shop kill ms paint.

anyway that looks like it would work great. But the only problem i see is when the piston thing behind the spring is pushed forward the spring will keep it and the cartride in place.
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Unread postAuthor: mopherman » Mon Jun 11, 2007 4:52 pm

pyromaniac wrote:Mopher did you make that if so photo shop kill ms paint.

anyway that looks like it would work great. But the only problem i see is when the piston thing behind the spring is pushed forward the spring will keep it and the cartride in place.

i also worried about this. i would have to experiment with diferent spring tenshions (sp). I think at high pressure with a realtivly heavy projectile, it should work ok. I was thinking a lead slug?

and yes, i did use photshop. It kicks the crap out of paint
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Unread postAuthor: Acdcmonkey1991 » Mon Jun 11, 2007 6:38 pm

this is a diagram of what your looking for i think...
ps. paint kicks the crap out of photoshop!!
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Unread postAuthor: Acdcmonkey1991 » Mon Jun 11, 2007 6:40 pm

this is it
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Unread postAuthor: hi » Mon Jun 11, 2007 6:42 pm

what if the ehaust was a burst disk and you just poked it with something to exhaust? that should work if you want it to work like a gun.
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"physics, gravity, and law enforcement are the only things that prevent me from operating at my full potential" - not sure, but i like the quote

you know you are not an engineer if you have to remind yourself "left loosy righty tighty"
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Unread postAuthor: mopherman » Mon Jun 11, 2007 6:58 pm

Acdcmonkey1991 wrote:this is a diagram of what your looking for i think...
ps. paint kicks the crap out of photoshop!!

well thanks for the imput, but im going for a trigger behind the loader. did you look that the link to the maginegun mechanism? i think im going to have like a spring loaded lever with a trigger shape to push it out of place.
like this
http://s9.photobucket.com/albums/a92/mo ... ed-1-1.gif

sorry for the shitty diagram, i was in a hurry
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Unread postAuthor: Suppressive Fire » Mon Jun 11, 2007 7:30 pm

I really hate to burst everyones bubble but this project is actually illegal in the vast majority of the world. You see, the precharged cartridges are a great idea and all but they are the equizalent of a rifle, pistol, or shotgun round. It is illegal to construct and use a firearm. This gun is in the eyes of the gov't at least a firearm. The potenial energy is contained in a cartridge the the gun will trigger to release a projectile (basic definition of a firearm). This was actually suggested over at spudtech when it was still up. I'll try to dig out the thread for you guys.
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Unread postAuthor: hi » Mon Jun 11, 2007 7:34 pm

Suppressive Fire wrote:I really hate to burst everyones bubble but this project is actually illegal in the vast majority of the world. You see, the precharged cartridges are a great idea and all but they are the equizalent of a rifle, pistol, or shotgun round. It is illegal to construct and use a firearm. This gun is in the eyes of the gov't at least a firearm. The potenial energy is contained in a cartridge the the gun will trigger to release a projectile (basic definition of a firearm). This was actually suggested over at spudtech when it was still up. I'll try to dig out the thread for you guys.


thats why you dont let the cops see. just kidding :wink:

i dont think it is because acording to the police (in my area) pneumatics are fine. i think its still smart to check though.
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"physics, gravity, and law enforcement are the only things that prevent me from operating at my full potential" - not sure, but i like the quote

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Unread postAuthor: Suppressive Fire » Mon Jun 11, 2007 7:49 pm

Its not just a pneumatic launcher. There is a gun and the pressure source is stored in precharged cartridges. All the gun does is provide a barrel and trigger the cartridge. In a regular luancher the pressure source is connected so it is vented out the barrel and the gun contains a valve which dumps air through the gun and out the barrel. This gun contains the mechanisms to trigger a disposable or reusable pressure source that when depleted is replaced by another. I know it seems like a fuzzy line but when you get to far into the fuzzy our wonderful and fun pastime gets a crapload of flak from the media and the noose of laws tightens even further around or necks. Who knows where you live it might not be illegal, but do yourself a favor and look into it. It'll take 15min and possibly save you jail time. Don't forget freedom of information is a double edged sword. You can learn alot with all the freedom but since all the information was right there they don't let you pleed ignorance.
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Unread postAuthor: jackssmirkingrevenge » Mon Jun 11, 2007 9:43 pm

I really hate to burst everyones bubble but this project is actually illegal in the vast majority of the world.


The only place where this sort of airgun is specifically illegal is the UK, which banned weapons chambered for the brocock air cartridge in 2004 over claims that they were readily converted to firearms.

a little background on the air cartridge

air cartridge guns sold in US, and here and here - so tell me, how can a home-made one be illegal?

think this would work?
no trigger yet
http://s9.photobucket.com/albums/a92/mo ... current=di agram.gif


yep, thats the general idea

ps. paint kicks the crap out of photoshop!!


agreed, I make all my diagrams with paint :)

what if the ehaust was a burst disk and you just poked it with something to exhaust?


not as easily re-usable as a schrader, plus I'l like to keep the cartridge as a clean cylinder without threaded unions of larger diameter.
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