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Self powered pmeumatic gun

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: pizlo » Wed Oct 07, 2009 2:03 pm

He doesn't want to post if where children can see it :roll: built more powerful things when I was still in the single digits.

hahah and the felon part is lol...
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Unread postAuthor: D_Hall » Wed Oct 07, 2009 3:26 pm

pizlo wrote:hahah and the felon part is lol...

Haven't watched the video yet (firewall issues). I'm guessing the guy in the video says he can't own a gun because he's a felon? Yeah, LOL.

I always liked Gordon Liddy's response to that question (paraphrased to the best of my recollection): "I'm a felon. I don't own any guns. MRS LIDDY, on the other hand, owns an arsenal."


I also recall reading an article wherein somebody discussed the extraction/purification of nicotine from cigars. Short version was that they took an off the shelf semi-auto pellet gun and turned it into a very deadly weapon simply by putting enough nicotine to drop a rhino into hollow-tipped pellets.
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Simulation geek (GGDT / HGDT) and designer of Vera.
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Unread postAuthor: pizlo » Wed Oct 07, 2009 4:49 pm

Haven't watched the video yet (firewall issues). I'm guessing the guy in the video says he can't own a gun because he's a felon? Yeah, LOL.

Dead on :) Then he says he lives in a bad apartment complex and that the gun is for "home defense" anything that can get through a nice solid door can get past this gun lol...
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Unread postAuthor: Northir » Wed Oct 07, 2009 7:17 pm

Well it took me all of 10 min to replicate this with stuff laying around, pump only, heres a video, sorry for crappy quality.
BAH vid to dark gona reshoot it in a sec
Image
i just connected it to my air sniper and it works well, i think ill find a diffrent power supply though, video in a sec

here she be
Image
my studio is dark :(

EDIT, i dont know about this guys but this thing packs a serious punch been shooting it inside and just had a ricochet using AAA batteries as ammo and it tore through my back pack and destroyed my paint ball holder on the shelf
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Unread postAuthor: Northir » Mon Oct 12, 2009 1:38 am

Bah hit quote instead of edit >.<

Little update i just pulled it off of my sniper and attached it to my GB cannon and it runs up to about 100psi before i shut it off, works great but runs loud and hot
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Unread postAuthor: inonickname » Mon Oct 12, 2009 4:24 am

You would be surprised how much energy it takes to stop someone dead. Unless you have a powerful gun, it's better to defend your home with a knife.
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Unread postAuthor: Ragnarok » Mon Oct 12, 2009 6:52 am

inonickname wrote:You would be surprised how much energy it takes to stop someone dead.

Not much. A few joules of electricity across the heart. It'll stop them, 'cause they'll be dead. :tongue3:
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Does that thing kinda look like a big cat to you?
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Unread postAuthor: jackssmirkingrevenge » Mon Oct 12, 2009 7:04 am

inonickname wrote:You would be surprised how much energy it takes to stop someone dead.


Rather, to reliably stop someone dead. There are a significant number of unlucky deaths which occur due to accidents with sub-12 ft/lb airguns that happen to strike a vital area. Not the sort of discussion we ought to be having here though, aside from to point out that even low powered launchers can be deadly in the right circumstances, so maximum safety should be exercised at all times.
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Unread postAuthor: Ragnarok » Mon Oct 12, 2009 7:35 am

I think he meant it in the sense of a "dead stop", rather than "Stopped, dead".

Sure, less than 12 ft-lbf can kill under certain circumstances. It is seldom however a prompt death that would stop any in their tracks and so is more likely to prove to annoy your target enough that they then kill you.

If it's not putting out at least a few hundred ft-lbf, it's not anything I'd consider an effective "home defence".
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Unread postAuthor: jackssmirkingrevenge » Mon Oct 12, 2009 7:56 am

Ragnarok wrote:If it's not putting out at least a few hundred ft-lbf, it's not anything I'd consider an effective "home defence".


I'd be happy with 22LR*

*providing this was doing the feeding :D though of course if you're overenthusiastic with your trigger finger there won't be much "home" left to defend...
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Unread postAuthor: Ragnarok » Mon Oct 12, 2009 8:19 am

Yeah, but that's basic maths for you. 100 ft-lbf x 1200 rpm = a lot of holes in whatever is downrange.

I think this video demonstrates it better though:
[youtube]http://www.youtube.com/watch?v=iwXWAamCpVE[/youtube]

I wouldn't necessarily rate it over a decent 12-gauge for home defence though.
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Unread postAuthor: jackssmirkingrevenge » Mon Oct 12, 2009 8:46 am

Ragnarok wrote:I wouldn't necessarily rate it over a decent 12-gauge for home defence though.


Well, with the equivalent projectile calibre, single 12 bore round filled with N<sup>o.</sup> 4 buck is typically 27 x 20 grain projectiles. The 180 will spit out 20 x 40 grain projectiles for every second on the trigger, I would say that would have pretty much the same effect in a much more controllable weapon.
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Unread postAuthor: Ragnarok » Mon Oct 12, 2009 9:31 am

But the 12 gauge delivers that in one. You can't really talk about "delivering a second of fire" - because really, in combat, a second is a long time to be still if you're being shot at (and more specifically, hit).

Sure, if you can accurately track your target with the Am180, the two are probably similarly effective. But the shotgun negates the need to track the target - and can also deliver heavier, larger projectiles with deeper penetration. You're not limited to #4 buck in a shotgun.

So, under the circumstances that the shotgun were limited to #4 buck, and you could only fire one shot a second (whereas, in reality, two a second is perfectly within reason), and you're particularly good at tracking a target, the two might be of equal virtue in combat.

However, those conditions do not apply. But, I will admit that you could probably convince any intruder to surrender WITHOUT hitting them with the Am180 in your hands - I'm sure full auto fire is very persuasive like that.

Still, given that you can own a shotgun for a whole lot less money than an Am180...
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Unread postAuthor: Moonbogg » Mon Oct 12, 2009 9:52 am

jackssmirkingrevenge wrote:
john bunsenburner wrote:A bit of outload thinking: Imagin a self built pump with a gasoline engine(one stroke) connected to a simple compressor. You would need a rather large pump but isn't that a GREAT way to have on board air supplies and fairly high pressure?


Something like this heavily geared down and hooked up through a crank to a shock pump would be an interesting proposition, however starting these little beasts every time is a bit of a hassle, electric sounds like a more convenient option. Look to things like chordless drills for powerful motors and batteries.


OK dude this is a great idea for mixing where fans can't normally be used. Imagine A small electric r/c motor with a shaft going in the chamber with small metal fan blades. Thats great. You could push a button and that fan would spin super fast and insta-mix the fuel. You could even hide the motor underneath the chamber by using a small flexible shaft.
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Unread postAuthor: jackssmirkingrevenge » Mon Oct 12, 2009 11:21 am

Ragnarok wrote:Still, given that you can own a shotgun for a whole lot less money than an Am180...


And there's nothing quite like racking that pump :D
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