an idea for semi, possible fully automatic

[grumpy]

instead of a fan to vent and mix the propane and oxygen, why not use a piston like the c-3 paintball marker. iknow it is a pump but it wouldn't be hard to make it semi auto.

[jimmy101]

Grumpy, that's probably the most practical suggestion yet.

Fire the gun. Shove the piston forward to push the gases out the barrel. Open a pressurized air line with the propane line plumbed into it with a needle valve (basically create a carburetor). Retract the piston. When the piston has fully retracted fire.

Might work OK for a fairly small chamber. For a large one you'll need a lot of force to move a piston that is big enough. The gun will bounce back and forth just form the motion of the piston. You might be able to get a small chamber to fire once a second without too much trouble. (Though you still need a chambering mechanism for the ammo.)

[grumpy]

here is an animation of the c-3 it might help more to understand how it works. well can't post it, it says it's to large so here is link , just scroll down to the c-3.
http://www.zdspb.com/tech/misc/animations.html

don't see why you couldn't make it bigger, just use a low preasure air ram to cock it . at low enough pressure it could also be operated off of propane.

[starman]

As a followup to the revolver....I've been kicking around a dual chamber idea that could conceivably be configured to be fueling one chamber while the other is prepared to shoot. I have no real details but it should be fairly doable albeit with a little complexity to make real semi capable.

[robbo@robbo]

i spose from what i am hearing, if i used my idea and made six more copies and had them rotating, i would have a gatling gun, and should work.
i know it's not as easy as that but you all know what im going on about

[psycix]

Or you could make a mechanism that has a piston in a tube sliding up and down, sucking fuel and oxygen in, and pumping it into your chamber every shot.
I plan to make a pump-action hybrid one day that would work a bit like that.

@robbo
If you would make such a gatling gun, it would be very awesome, but building such thing in reality will be harder.

[robbo@robbo]

yeah i do like the idea, but now it's looking at being bigger than i had hoped and i don't know if i can get away with it living at work hmmmmm
o well its gotta be tried and pics of the build will b posted, everyone shoud have one

starman i like the sounds of that, for a quicker fire rate i could have say 6 barrels doin this and would make things a bit easier if i used pistons ect as behind the rotating chambers i could have a ring thats 'on the wong' so as the con rods slide along it the pistons move in and out, if you see what i mean

[psycix]

About the piston idea:
Make sure the piston is secured REALLY good and do NOT stand behind such a gun.
If that thing comes popping out, its basically the same as standing in front of the device: it hurts like hell.