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air rifle idea.

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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air rifle idea.

Unread postAuthor: chinnerz » Mon Jan 18, 2010 3:52 am

here is an idea i had from looking at a few other pictures.

the system works via a hammer hitting a pin on the barrel its self, moving the barrel backwards, exposing a hole to pressurised air and pushing the projectile outwards.

will this work? and if it does, will it work well?
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Unread postAuthor: jackssmirkingrevenge » Mon Jan 18, 2010 4:01 am

Something like this ;)

Image

A long time ago I had thought up a similar design powered by an electrically driven eccentric cam to give full auto:

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Those were just concepts though, but Antonio had made a few working prototypes along those lines.
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Unread postAuthor: chinnerz » Mon Jan 18, 2010 6:06 am

hmm, very nice. but with the whole barrel moving, will it affect the accuracy significantly?
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Unread postAuthor: jackssmirkingrevenge » Mon Jan 18, 2010 6:34 am

chinnerz wrote:With the whole barrel moving, will it affect the accuracy significantly?


That never bothered the Bofors series of autocannon or the Browning M2 50 cal ;)

As long as it moves consistently it shouldn't be a problem.
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Unread postAuthor: Ragnarok » Mon Jan 18, 2010 12:43 pm

chinnerz wrote:hmm, very nice. but with the whole barrel moving, will it affect the accuracy significantly?

To be honest, you're probably not going to get enough accuracy anyway that a well made moving barrel will notably affect things.

But, as Jack points out, the M2HB uses a moving barrel - what he doesn't note however, is that the M2HB was responsible for the 20th century's longest range combat kill, at ~2500 yards.

It's a record that has only been bettered twice, and even then only by a few percent - both times, it was done by a dedicated sniper rifle.
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Does that thing kinda look like a big cat to you?
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Unread postAuthor: jackssmirkingrevenge » Mon Jan 18, 2010 12:59 pm

Ragnarok wrote:But, as Jack points out, the M2HB uses a moving barrel - what he doesn't note however, is that the M2HB was responsible for the 20th century's longest range combat kill, at ~2500 yards


I didn't want to bringGunny Hathcock into the debate :P :)
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Unread postAuthor: Ragnarok » Mon Jan 18, 2010 1:08 pm

Still a perfectly important illustration of what accuracy can be had out of a moving barrel - although it obviously can't add accuracy, it doesn't mean any has to be lost.
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Unread postAuthor: chinnerz » Mon Jan 18, 2010 7:35 pm

cool, well i will look into this idea, maybe draw up a few concepts of my own
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