Coiled barrel ?

[evilvet]

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.

[jackssmirkingrevenge]

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



Air pistol from the Beeman Collection:



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.

[evilvet]

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

[Hotwired]

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

Bit of fiddling with copper tube should get you there.

[jackssmirkingrevenge]

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

LOLOL!

Those Nazis eh *chuckle*

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

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

[Technician1002]

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.

[evilvet]

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.

[jackssmirkingrevenge]

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.

Joys of matrimony eh