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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: jackssmirkingrevenge » Sun Jul 24, 2011 4:34 pm

warhead052 wrote:Wait, so if you pull back on it, how are you going to make a gun that will actually use them? Some sort of pneumatic piston that pushes them forward or something?


A spring loaded hammer, something like this:
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Unread postAuthor: jor2daje » Fri Sep 02, 2011 1:39 am

just throwing a reply in here to say its looking great jsr and to make sure I get email notifications haha
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Unread postAuthor: LovableAirGuns » Fri Sep 02, 2011 5:58 am

Very keen to see thus finshed, its looking good.
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Unread postAuthor: jackssmirkingrevenge » Sun Sep 11, 2011 12:38 am

Just a niggling thought, converting a 7.62/308 cartridge to pneumatic using a 7mm OD tube insert:
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Unread postAuthor: jhalek90 » Sun Sep 11, 2011 1:27 am

you last videos look like a much more complex version of what i did over a year ago.

Take a female quick disconnect, and remove all the internals except for the rubber washer, and the bearings.... it will hold a 7/16'' steel ball air tight.

I have taken that design up to 350 psi... the only problem i had, was pulling the sleeve back at higher pressure. Your idea of using a hammer to move the sleeve is excellent. I now want to revisit my design.

Thanks!
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Unread postAuthor: LeMaudit » Sun Sep 11, 2011 6:36 am

Did you got some inspiration from here ? ;-)
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Unread postAuthor: jackssmirkingrevenge » Sun Sep 11, 2011 6:51 am

LeMaudit wrote:Did you got some inspiration from here ? ;-)


Totally :roll: :D

Doing some prototyping in the meantime, another pop at the hybrid cartridge and a decent fill rig.
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Unread postAuthor: jackssmirkingrevenge » Tue Aug 07, 2012 12:46 am

Something which came out of this visit, I got to look at a Korean air cartridge rifle from the 1950s. They work on the same principle as the Saxby Palmer air carts, basically a hammer valve where the hammer smacks the bottom of the cartridge pushing it against the valve.

This is the English variation:

Image

Image

This is the one I saw yesterday, bigger internal volume and apparently in the 50 ft/lbs range...
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Unread postAuthor: iknowmy3tables » Wed Aug 08, 2012 7:21 am

I really like the idea of a large hammer valve that also acts as the check valve for filling, however I've never seen any of us use a fill valve that wasn't a quick connect or a Schrader
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Unread postAuthor: jackssmirkingrevenge » Wed Aug 08, 2012 11:25 am

iknowmy3tables wrote:I really like the idea of a large hammer valve that also acts as the check valve for filling, however I've never seen any of us use a fill valve that wasn't a quick connect or a Schrader


Looks like you missed this ;)
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Re: preloaded pneumatic cartridge

Unread postAuthor: jackssmirkingrevenge » Sun Dec 20, 2015 3:50 pm

Revisiting this idea in my head, looks to me that a variation of the Saxby Palmer with a balanced spool would make a lot of sense. There's still the o-ring friction but nothing like the force of keeping a poppet type valve closed, which would mean less force to open it, so the bolt spring might be weak enough to allow for shell ejection and therefore potentially semi/full auto fire...

Image

edit: alternative configuration with greater internal volume:

Image
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Re: preloaded pneumatic cartridge

Unread postAuthor: wyz2285 » Mon Dec 21, 2015 5:20 am

You would have to reverse the fill plug on the last design.
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Re: preloaded pneumatic cartridge

Unread postAuthor: jackssmirkingrevenge » Mon Dec 21, 2015 6:59 am

Oh no it's one of these:

Image

Wonderful things, if only I had discovered them earlier.
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Re: preloaded pneumatic cartridge

Unread postAuthor: jackssmirkingrevenge » Mon Aug 22, 2016 11:46 am

Some more idle musings, combining the locked projectile "valveless" design with a balanced spool. The problem with the latter is that even in small calibers, beyond a certain pressure it becomes far too difficult to actuate when made like this, however if you incorporate in a system where the friction is being balanced out in the opposite direction it should make it relatively easy to fire without too much effort.

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