"Sabotless" Semi-Automatic Shotgun Concept

Show us your pneumatic spud gun! Discuss pneumatic (compressed gas) powered potato guns and related accessories. Valve types, actuation, pipe, materials, fittings, compressors, safety, gas choices, and more.
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jackssmirkingrevenge
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Sat Feb 23, 2019 9:03 am

An idle thought that is basically the unholy marriage of a nailgun and paintball marker:

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The benefit is that it will fire whatever fits in the barrel and it doesn't need to be airtight, indeed it could be fed though a hopper of shot of whatever size doesn't fall though the detents at the breech. The disadvantage is that the projectile can only go as fast as the piston, meaning that arresting it would be a significant engineering challenge for something with decent ballistic performance.
hectmarr wrote:You have to make many weapons, because this field is long and short life
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farcticox1
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Sat Feb 23, 2019 9:10 am

[youtube][/youtube]
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Anatine Duo
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Sat Feb 23, 2019 10:42 am

Potential for quiet launching of very heavy projectiles
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jackssmirkingrevenge
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Sat Feb 23, 2019 11:19 am

Indeed, noise abatement is one of the consequences of allowing the gasses room to expand before exiting to the atmosphere.
hectmarr wrote:You have to make many weapons, because this field is long and short life
brianz
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Wed Feb 27, 2019 10:54 pm

It will fire whatever fits in the barrel
brandon2513
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Sun Sep 01, 2019 6:07 pm

jackssmirkingrevenge wrote:An idle thought that is basically the unholy marriage of a nailgun and paintball marker:

Image

The benefit is that it will fire whatever fits in the barrel and it doesn't need to be airtight, indeed it could be fed though a hopper of shot of whatever size doesn't fall though the detents at the breech. The disadvantage is that the projectile can only go as fast as the piston, meaning that arresting it would be a significant engineering challenge for something with decent ballistic performance.
How do you make the animations? Like which software.
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jackssmirkingrevenge
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Tue Sep 03, 2019 1:40 am

brandon2513 wrote:How do you make the animations? Like which software.
It's actually quite a primitive process, MS Paint and ezgif.com
hectmarr wrote:You have to make many weapons, because this field is long and short life
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Brian the brain
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Tue Oct 15, 2019 3:27 am

Nice main valve ;) :D
Gun Freak wrote:
Oh my friggin god stop being so awesome, that thing is pure kick ass. Most innovative and creative pneumatic that the files have ever come by!

Can't ask for a better compliment!!
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jackssmirkingrevenge
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Tue Oct 15, 2019 9:10 am

Brian the brain wrote:Nice main valve ;) :D
I got the idea off some guy on this forum, don't remember his name :roll: :P
hectmarr wrote:You have to make many weapons, because this field is long and short life
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jackssmirkingrevenge
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Sun Jun 21, 2020 5:27 am

I was having a bit of a think about this idea and it seems it could be greatly simplified and also made more efficient:

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The piston itself becomes the hammer that opens an inline balanced valve.
hectmarr wrote:You have to make many weapons, because this field is long and short life
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hectmarr
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Sun Jun 21, 2020 9:51 am

jackssmirkingrevenge wrote:
Sun Jun 21, 2020 5:27 am
I was having a bit of a think about this idea and it seems it could be greatly simplified and also made more efficient:

Image

The piston itself becomes the hammer that opens an inline balanced valve.
It is good simplification. I think that the stem that drives the projectile in his drawing, can do several other things, apart from what he proposes, such as compressing the mixture and at the end of the tour, activating an ignition, is just what comes to mind. The piston attached to the stem should be smaller to add more pressure than delivered on the larger piston than you draw.
In the piston stroke to the right, in the drawing, the mixture is sucked, when the valve lets compressed air pass, it moves to the left and the piston is blocked by the trigger mechanism, for the explosion. Then when you pull the trigger, it all happens again.
Ideas don't make holes. The weapons yes! ;)
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hectmarr
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Sun Jun 21, 2020 2:13 pm

A different application from your idea.
The trigger you actually draw is the initiator of the recharge of the repeat hybrid. It is the mechanical locking of the piston, which allows it to move to the right, by the action of the spring, and then, to the left by the action of compressed air. To fire, the trigger is the piezoelectric.
What I have added is a "StrongBoy" type mono-pumped weapon with a side bb`s loading system.
The firing sequence is: Press the green "trigger", which you drew, and the weapon is traced, and then press the button on the piezo spark arrester, and firing occurs.
What I write is off topic, but it was just an idea.
With a 2 "piston in its design, and about 6 bar of air pressure, being the hybrid's piston 1.5 cm in diameter it can be compressed to about 68 X ... nI CRAZY WOULD USE THAT PRESSURE, but if you use less is feasible to work The part of the hybrid is proven and works well What you designed, I am totally sure that it works, for the clear and simple design.
I leave an adapted drawing, to explain better.
LBC, sistema carga bolillas acero .25.png
Ideas don't make holes. The weapons yes! ;)
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Mon Jun 22, 2020 9:57 am

jackssmirkingrevenge wrote:
Sun Jun 21, 2020 5:27 am
I was having a bit of a think about this idea and it seems it could be greatly simplified and also made more efficient:

Image

The piston itself becomes the hammer that opens an inline balanced valve.
If the trigger sear left closed. (not catch piston)
Would it be automatic in action.?
Doc j
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Mon Jun 22, 2020 10:17 am

Doc j wrote:
Mon Jun 22, 2020 9:57 am
jackssmirkingrevenge wrote:
Sun Jun 21, 2020 5:27 am
I was having a bit of a think about this idea and it seems it could be greatly simplified and also made more efficient:

Image

The piston itself becomes the hammer that opens an inline balanced valve.
Sorta thinking out loud.
Piston be generating air infront of it, as headed toward vavle. (Could be a positive)
Thinking hav to equate for that, with longer valve stem.
Then on return, the vent cop a double wanmmy.
Air generated from piston Oposing side.
Again from pressure side.
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jackssmirkingrevenge
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Mon Jun 22, 2020 8:06 pm

hectmarr wrote:
Sun Jun 21, 2020 2:13 pm
The trigger you actually draw is the initiator of the recharge of the repeat hybrid. It is the mechanical locking of the piston, which allows it to move to the right, by the action of the spring, and then, to the left by the action of compressed air. To fire, the trigger is the piezoelectric.
What I have added is a "StrongBoy" type mono-pumped weapon with a side bb`s loading system.
The firing sequence is: Press the green "trigger", which you drew, and the weapon is traced, and then press the button on the piezo spark arrester, and firing occurs.
Some interesting thoughts!

Image

My first reaction was "why use air to compress the system when you could use a spring?"

The advantage of using air could be that you could indeed achieve some tremendous gas mix pressures...
Doc j wrote:
Mon Jun 22, 2020 10:17 am
Then on return, the vent cop a double wanmmy.
Air generated from piston Oposing side.
Again from pressure side.
That is a very good point! As drawn the piston would probably never even reach the valve stem if it is air tight...
hectmarr wrote:You have to make many weapons, because this field is long and short life
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