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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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Re: preloaded pneumatic cartridge

Unread postAuthor: jackssmirkingrevenge » Wed Feb 27, 2019 8:53 am

I think it would be easier to build like this, for much the same effect:

Image
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hectmarr wrote:You have to make many weapons, because this field is long and short life
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Re: preloaded pneumatic cartridge

Unread postAuthor: hectmarr » Wed Feb 27, 2019 10:24 am

Yes! That is simpler to build, no doubt. When I finish the current projects, I will try to shape some idea of these.
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Re: preloaded pneumatic cartridge

Unread postAuthor: jackssmirkingrevenge » Wed Mar 27, 2019 7:22 am

Now that I'm scratched the hammer valve itch I think I'll get back to this, I have an airsoft 1911 frame lying around that I think will make a good basis for a shot pistol, initially single shot but with the option to make a side-loading magazine.

Here's a quick scale drawing of what it would look like using a 1" OD 0.825" bore cartridge:

Image

The green bolt would have a flat milled on its left side to allow it to travel past an ejector that would swing the cartridge out towards the right side on firing.
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hectmarr wrote:You have to make many weapons, because this field is long and short life
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Re: preloaded pneumatic cartridge

Unread postAuthor: hectmarr » Wed Mar 27, 2019 9:49 am

The project looks very interesting. The cartridge works perfectly, from what I saw, it only remains to make the weapon with the hammer. I like it! :)
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Re: preloaded pneumatic cartridge

Unread postAuthor: jackssmirkingrevenge » Sun Apr 21, 2019 7:16 am

Image

Nothing new under the sun is there, patent for an exhaust valve air cartridge with a spool piston from 1888 :roll:
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hectmarr wrote:You have to make many weapons, because this field is long and short life
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Re: preloaded pneumatic cartridge

Unread postAuthor: hectmarr » Tue Apr 23, 2019 8:48 pm

jackssmirkingrevenge wrote:Image

Nothing new under the sun is there, patent for an exhaust valve air cartridge with a spool piston from 1888 :roll:

Incredible that this concept exists since 1888, although surely with the technology of the present, everything must be more efficient and improved. The ideas in general are all old but are permanently improved by the engineers of later times. Look at the pictures, this is what I mean 8)
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Re: preloaded pneumatic cartridge

Unread postAuthor: jackssmirkingrevenge » Mon Apr 29, 2019 4:42 am

hectmarr wrote:Incredible that this concept exists since 1888, although surely with the technology of the present, everything must be more efficient and improved. The ideas in general are all old but are permanently improved by the engineers of later times.


Very true, while there have been huge advances in materials, manufacturing techniques and electronics/computing, when it comes to mechanical concepts there has been little progress after the explosion of ideas that emerged during the industrial revolution.
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Re: preloaded pneumatic cartridge

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Re: preloaded pneumatic cartridge

Unread postAuthor: jackssmirkingrevenge » Wed Jul 17, 2019 5:20 am

Thoughts about an air cartridge for a shotgun:

Image

I figure you can't have the projectile inside a thin-walled cartridge mouth without risking it being distorted to the point that it's not re-usable, so a delrin sabot would be inevitable. It would then make sense to use it to plug the main porting in a balanced fashion. With a small diameter spool actuated by the firing pin, it doesn't take much pressure to upset the balance fire.
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Re: preloaded pneumatic cartridge

Unread postAuthor: hectmarr » Wed Jul 17, 2019 7:44 am

I like the idea. Are you trying to build this?
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Re: preloaded pneumatic cartridge

Unread postAuthor: jackssmirkingrevenge » Wed Jul 17, 2019 8:30 am

hectmarr wrote:Are you trying to build this?


Probably soon because I have one of these to try out and nowhere practical for the time being with conventional ammunition.
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Re: preloaded pneumatic cartridge

Unread postAuthor: hectmarr » Wed Jul 17, 2019 9:14 am

It looks good! :)
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Re: preloaded pneumatic cartridge

Unread postAuthor: jackssmirkingrevenge » Fri Jul 26, 2019 9:02 am

Made a prototype, the idea works but it's a little unstable in that the slightest leak will cause it to fire, not ideal:

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hectmarr wrote:You have to make many weapons, because this field is long and short life
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Re: preloaded pneumatic cartridge

Unread postAuthor: hectmarr » Fri Jul 26, 2019 9:25 am

A lock can work. When you insert the cartridge into the chamber it unlocks the element that is triggered when pressed by the adjusted cylindrical environment of the chamber. When it is outside the weapon, the lock protrudes and the element that fires cannot escape, even if it loses a bit of air. I like how it is built. Good job. :)
Gravity keeps the locking element in the cartridge inside the chamber. With three it is enough to keep the element that is shot, always locked, in any spatial position. When the cartridge enters, the "collar" of a few neodymium magnets automatically retracts the latches, and the element that fires out can exit. It is a possibility to solve the danger posed by a cartridge that can be shot in your hands. A matter of seeing some other solution.
Another possible solution is to let the air out of the loss, if it exists. It is only necessary to make a small hole, perhaps with 1 mm or less, it is enough. This will prevent pressure build-up and the resulting component force longitudinally. When firing, the o´ring covers the small hole and no air leaks through the duct. ... :roll:
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