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Coiled barrel ?

This area is for the discussion of BB or airsoft sub machine guns, and or other small arms such as pellets.
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Coiled barrel ?

Unread postAuthor: evilvet » Mon May 03, 2010 4:44 pm

Morning all

A French Horn is about 3 metres long; it's just that they coiled up the air tube so you could handle it in tight spaces. The length of the vibrating column of air didn't change, just the layout.

So........

I want a reasonable length barrel on the BBMG to maximise muzle velocity with the fixed air supply I have. I also want a compact form factor.

Can I coil at least a portion of my barrel ? I assume increased friction will be an issue as the centripital acceleration comes into play, but will this be a limiting factor ?

This may be right up there with perpetual motion machines but I have my anti-mocking cloak on this morning so dont care.

Fire when ready.
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Unread postAuthor: jackssmirkingrevenge » Mon May 03, 2010 4:57 pm

Not as crazy as you think, a curved barrel worked for the Germans in WW2:

Image

Air pistol from the Beeman Collection:

Image

In practice though, I think for compact power you want to look into ways of cranking up pressure and valve flow as well as adding a detent, this will more than make up for a shorter barrel.
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Unread postAuthor: evilvet » Mon May 03, 2010 5:05 pm

LOL, I love the machine gun, those crazy Nazi's, what a crew.
BTW, can I ask what you use to create those great grapihcs you post ?

Thanks
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Unread postAuthor: Hotwired » Mon May 03, 2010 5:05 pm

Could try making the barrel do a 180 and have an over-under layout.

Bit of fiddling with copper tube should get you there.
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Unread postAuthor: jackssmirkingrevenge » Mon May 03, 2010 8:41 pm

evilvet wrote:LOL, I love the machine gun, those crazy Nazi's, what a crew.


LOLOL!

Those Nazis eh *chuckle*

:D :D :D

BTW, can I ask what you use to create those great graphics you post ?


Nothing fancy, good old MS paint. Some great tips here ;)
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Unread postAuthor: Technician1002 » Mon May 03, 2010 9:29 pm

You must remember that some of the projectile KE will be transferred to the barrel if the barrel is permitted any motion such as a handheld device. The force required to change the direction of the projectile has an equal and opposite reaction and a resulting transfer of energy. Energy used to move the barrel is energey removed from the projectile.
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Unread postAuthor: evilvet » Tue May 04, 2010 4:53 pm

Nothing fancy, good old MS paint. Some great tips here


Thanks, much appreciated.

Sorry for the delay in pics on the electro prototype, I have to wait for a time when SWMBO is not lurking, listening for the rat-tat-tat, before I get back in the workshop. :roll:
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Unread postAuthor: jackssmirkingrevenge » Tue May 04, 2010 11:22 pm

evilvet wrote:I have to wait for a time when SWMBO is not lurking, listening for the rat-tat-tat, before I get back in the workshop. :roll:


Joys of matrimony eh :roll:
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