Propane Semi-auto <--real idea

this is the first coherent and logical c3 semi idea i have ever seen.

edit: but i think you really need a way to flush the chamber, dumping more mixture into the old spent gas won't work reliably

Edited by pattison - 30 July 2006 at 9:08pm

Your going to also need a way to engineer a reliable cooling system. With all that combustion the gun will start to heat up from the faster shooting.

Ok, I have a second reincarnation.


This one has an exaust "squeegy" that will follow the bolt while its one way flaps are open. Then as the bolt pushes the squeegy back the flaps close and push the exaust out the back.

Im not real sure if the spring will have enough time to engage the squeegy and push it to the front of the chamber before the bolt pushes it back. And sadly I forget my physics lessons.

If not, I successfully made a very compact C3.


Edited by Monk - 31 July 2006 at 1:43am

I see where you're going with that.

Ill put my spin on it.



I seriously feel very confindent that this idea will work.

I think it would be possible to do this with an ebolt and an automag.


Edited by Monk - 31 July 2006 at 2:24am

You got me thinking about the solenoid, and it would be abit more complicated than it needs to be.

So I went back to the drawing boards. and this is what I got so far.

When the bolt goes back, it will go alittle farther than needed, thus pushing in a valve to open the propane for a fraction of a second. Also note that none of these parts are to the scale of the others, so there is alot of imagination involved.



Bam, it took two brilliant minds, and ms paint. But we finaly have a design for a propane semi-auto.




Edited by Monk - 31 July 2006 at 12:32pm

The big problem is a safety system for the propane mixture. In the C3, the fuel injector valve is pushed in at the end of the pump stroke, but the real clever part is the valve fills itself up with regulated propane, meaning the propane inside the valve is a fixed volume at a fixed pressure. If the user double pumps the gun, since the pressure of the propane inside the valve is the same as the pressure being fed from the regulator, no more propane is added to the system.

Also, as a machinist, quite a few parts in your design would be very difficult to cut.

Just like everyother auto/semi auto propane idea, this wont work, it would get waaaaaaaaaaaaaaaaaaaaaaay to from the small exsplotions goin on inside your marker.

So ya, you could do it, and ya you can also seriously burn yourself and melt your own paintballs...

__sneaky__ wrote: Just like everyother auto/semi auto propane idea, this wont work, it would get waaaaaaaaaaaaaaaaaaaaaaay to from the small exsplotions goin on inside your marker. So ya, you could do it, and ya you can also seriously burn yourself and melt your own paintballs...

Its that kind of mind set that gets nothing done. I already have a cooling system in mind, so dont count me out yet.

I have been thinking about the set pressure.



That is my latest design. The bolt is what mixes the air and propane, and pushes it into the chamber on the way back to the cocked position.

I plan on using the same reg as the C3.

I also redesigned the bolt latch so that it could be easy to make. This one will be one unit that can be screwed into the chamber.

As far as heat is conserned, I found a site that sells a gel that allows virtually no heat through. So I would make a detachable shroud around the body of the gun that holds this gel.

EDIT: and again the picture is alittle off, it will be longer and the latch/squeegy placement will need to be refined. And I will do such on paper later. Im just looking for some helpful ideas as far as mechanics and pressures are concerned. Thanks.


Edited by Monk - 01 August 2006 at 1:46am

So I got to looking at the C3. I took the design of it, and added the blow forward bolt. I also got rid of the cocking handle and replaced it with a spring.

The bolt should move forward after the shot is taken, then on the way back pull the cocking rod back with it, then the rod will spring forward to it original position. Then it all starts again. Note: I havent established a way for the bolt to move the rod.



I mostly did this because the last design didnt have a velocity adjuster.

Oh snap, just got a new idea. One of my earliest designs for a paintball gun used a valve based on the rotary engine. So I thought well why not base a propane marker on the rotary engine.

Here is a simple idea that made. The compression stage should increase the efficiency of the marker.




Edited by Monk - 01 August 2006 at 5:25pm

Im having a hard time following where the exaust goes on that diagram.
EDIT: It is pushed out the barrel? Very good design. I think we need to make one. I have a question though.
How are your one way flap things designed? I have one design, it involves a bearing and a spring.

I continued research on the "Wankel gun". So far this is what Ive got.



There is a soleniod that stops the movement of the rotary piston at the compression stage. When the trigger is pressed, the solenoid pulls down and the ignition fires. The solenoid has the job of pulling the engine stop pin and putting propane into the intake.
However I do believe this gun will weigh too much. Just looking at different ideas to get the juices flowing.


Edited by Monk - 01 August 2006 at 8:13pm