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Chamber placement.

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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Chamber placement.

Unread postAuthor: warhead052 » Wed Mar 23, 2011 7:21 pm

If I were to use a M1A1 Stock and build my airgun in it, where should I place the chamber for optimum performance? I will attempt a bolt action reloading mechanism, but I would like to know where I should place my air tank. Should it go in the stock, or just in front of the trigger?
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Unread postAuthor: Gun Freak » Wed Mar 23, 2011 7:35 pm

The best looking and well performing design is a coax but you can't do a breech load if you do a coax because the barrel is inside the chamber. There is also the over/under design like this one:
http://www.spudfiles.com/forums/viewtopic.php?t=22401&
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Unread postAuthor: warhead052 » Wed Mar 23, 2011 7:38 pm

Ok. Hmm, I am trying to think of a way to do a coax without it looking weird on a rifle stock.... If its too bulky it will look awkward and I want it to be clean and flush with the rifle. I may try that over under design though....
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Unread postAuthor: Zeus » Wed Mar 23, 2011 7:58 pm

If you do it right a coax could look good in a rifle http://www.libertycans.net/mjolnir.html

I've heard about breech loading in a coax, it only works with round projectiles and would be quite an exercise.
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/sarcasm, /hyperbole
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Unread postAuthor: warhead052 » Wed Mar 23, 2011 8:04 pm

Thanks Zeus, I will definatly TRY to make one but I may need some help. If you guys can give me some tips on what to get and use, I will definatly take them. When I get the stock I will upload a picture and give you specifications.
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Unread postAuthor: Gun Freak » Wed Mar 23, 2011 8:11 pm

What bore are you going for?
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Unread postAuthor: Hotwired » Wed Mar 23, 2011 8:36 pm

You can combine a coaxial chamber with an external valve in the manner of a klein bottle.

That way you have the neat single tube extending out but also the freedom to have any kind of breech loading system at the back.
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Unread postAuthor: Lockednloaded » Wed Mar 23, 2011 8:47 pm

Hotwired wrote:You can combine a coaxial chamber with an external valve in the manner of a klein bottle.

That way you have the neat single tube extending out but also the freedom to have any kind of breech loading system at the back.


like this?
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Unread postAuthor: Hotwired » Wed Mar 23, 2011 9:03 pm

I hope you realise you've linked to a thread with all its pictures dead :lol:

But yes it's the same thing.

You can put the valve in any part of the returning loop where chamber becomes barrel.
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Unread postAuthor: warhead052 » Wed Mar 23, 2011 9:26 pm

Hmm, I was thinking a 2 inch chamber (coax I guess...) with either a 1 inch barrel with a tip on the end for interchangeable barrels, or a 1/2 inch barrel for stuff like AA batterys and stuff.... Not fully sure... I will also think of a way to make a breech loading system, but that will come with a V2 prototype... I just need one successful gun under my belt before I start getting advanced....
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Unread postAuthor: Lockednloaded » Wed Mar 23, 2011 9:30 pm

Hotwired wrote:I hope you realise you've linked to a thread with all its pictures dead :lol:

But yes it's the same thing.

You can put the valve in any part of the returning loop where chamber becomes barrel.


Dangit, I had it in my technical examples folder and didn't even check the photos. It has a decent description though
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Unread postAuthor: ilovefire » Wed Mar 23, 2011 10:28 pm

was bored and thought of this dont know how practical it is or if it has any advantages over just a under and over design but here it is
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why make it if it dosent shoot?
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Unread postAuthor: JDP12 » Wed Mar 23, 2011 10:30 pm

pretty much a klein bottle as mentioned, it would work
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Unread postAuthor: ilovefire » Wed Mar 23, 2011 10:33 pm

ha ha yea thought it was just couldnt picture whether it was that or not, would it have any advantage on just an under over design? maybe just aesthetics
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why make it if it dosent shoot?
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Unread postAuthor: Lockednloaded » Wed Mar 23, 2011 10:48 pm

It obviously takes up less space since you're using the chamber around the barrel, but I don't think its really worth the effort
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