Pneumatic Pen-gun Project

[frankrede]

Very innovative. This probably qualifies as one of the smallest spudguns in history.

Thanks

The smallest semi-amateur pneumatic I can think of is this device: pop-shot micro gun - chambered in 0.177 using the Brocock micro air cartridge (now illegal in the UK thanks to your lovely government ) at about 900 psi.

I haven't seen a smaller co-axial though I could easily have gone smaller lengthwise but I wanted some measure of power.

I thought it said 300 psi and was made by a company

[Hawkeye]

It says 3000 and repeats it for emphasis...

[ammosmoke]

Yeah, didn't you catch that?

[jackssmirkingrevenge]

It says 3000 and repeats it for emphasis...

It's bollocks as far as I can tell, usually the brocock micro cartridges aren't filled past 1000 psi, I know from other sources. I didn't see them checking it with a gauge either.

and was made by a company

In Pakistan? Not so, it was hand crafted by Steve Harper in the UK

After doing the math this little gun should blast a relatively standard weight pellet just over the speed of sound
if it had a barrel a bit over 2 inches in length.

Also bollocks, even with a rifle length barrel the full size tandem air cartridge could barely manage 12 ft/lbs, let alone break the sound barrier with its micro version and a tiny barrel.

[ammosmoke]

Yeah, I'm gonna run it through GGDT and see what I get. Prob something similar to what you have. Man, they really must have exaggerated!!

[jackssmirkingrevenge]

For reference' sake, this is what the cart looks like from the inside:



(image taken from here)

It's fired by a firing pin striking the central stem and moving it forward.

[jackssmirkingrevenge]

sorry for the double post, but here's the patent for the air cart as well

[ammosmoke]

Well, IDK if its just me or what, but I can't get GGDT to run such small numbers successfully. It keep freaking out....

[frankrede]

It says 3000 and repeats it for emphasis...

I meant 3000

[chaos]

Well, IDK if its just me or what, but I can't get GGDT to run such small numbers successfully. It keep freaking out....

your projectile has a bigger diameter than the i-d of the barrel, and the reservoir data is wrong, somhow.

[Hotwired]

Yeah... a 0.0177 projectile won't shift anywhere in a 0.0166 barrel.

Also, don't you mean 0.177?

[jackssmirkingrevenge]

I'm being optimistic here, and only got half the speed of sound:

[TwitchTheAussie]

Jack could you possibly make me one? I got $5 and some lollies But seriously how much do I have to pay to get one?

[chaos]

can i put my order in, ill pay with some stainless tubing or something

[jackssmirkingrevenge]

how much do I have to pay to get one?

Including postage to Oz, too much sorry but I don't market complete launchers, besides, I'm already up to my ears in silencer orders at the moment.

However - honestly - I'm sure pretty much anyone could manage to build one. All you need is to rummage around your local model shop/hardware store for the right sizes of pipe, some decent 5 minute epoxy and a hacksaw.

You can use the money you saved to purchase a decent high-pressure shock pump