SpudFiles

So this is the pump action combustion I have been working on. It is not really a pump action because it does not use a pump to reload a projectile. It uses an air pump for a soccer ball to pump in fresh air and move CO2 out of the chamber. This is a lot more efficient because no caps or valves need to be opened. So of you may recognize this cannon from a previous post. It is different this time because it has an onboard meter, attached air pump, and a stock. The stock was something I threw in at the end to make it look better and easier to hold. The stock is from an M-1 garand. I was the weapons officer in my school's ROTC program and when the stocks break we throw them away. I just salvaged one and fixed it. This gun also features an actual trigger that I fashioned out of wood. The trigger strikes the sparker out of a hand-held bbq igniter. There is also a black push button on the side of the stock to turn on the fan.
Specs: 2" X 9.5" chamber, 48"X 3/4" barrel

The propane tank is not connected in the picture. I plan to improve on aesthetics by repainting it, hiding the zip ties and hose clamps, and making the meter look like a scope. This cannon works great. It takes only 3-4 pumps to ventilate and shoots paintballs at about 300-350 fps. I think it will work much better when I replace the prop on the fan with an actual fan blade. Overall I think this gun turned out great.

i think you kinda over engineered this in that, because instead of using the pump to pump out the used air, you could have just left the fan in the chamber and used that.

ps- is that a 10/22 stock?

Hahah i like the tiny fan

This looks like a advanced ghetto! I like it!

hi wrote: i think you kinda over engineered this in that, because instead of using the pump to pump out the used air, you could have just left the fan in the chamber and used that.

ps- is that a 10/22 stock?

Binder17 wrote: It uses an air pump for a soccer ball to pump in fresh air and move CO2 out of the chamber. This is a lot more efficient because no caps or valves need to be opened.

Binder17 wrote: The stock is from an M-1 garand. I was the weapons officer in my school's ROTC program and when the stocks break we throw them away. I just salvaged one and fixed it.

Quote pwnage. Yeah!

EDIT: good job on this. Now all you need is a higher displacement pump for true single-pump venting. Just wait until I finish my BBMG, we can walk around Kenzie and... dammit! (No squirrel jokes allowed on spudfiles) ...target practice.

markfh11q wrote:

hi wrote: i think you kinda over engineered this in that, because instead of using the pump to pump out the used air, you could have just left the fan in the chamber and used that.

ps- is that a 10/22 stock?

Binder17 wrote: It uses an air pump for a soccer ball to pump in fresh air and move CO2 out of the chamber. This is a lot more efficient because no caps or valves need to be opened.

Binder17 wrote: The stock is from an M-1 garand. I was the weapons officer in my school's ROTC program and when the stocks break we throw them away. I just salvaged one and fixed it.

Quote pwnage. Yeah!

EDIT: good job on this. Now all you need is a higher displacement pump for true single-pump venting. Just wait until I finish my BBMG, we can walk around Kenzie and... dammit! (No squirrel jokes allowed on spudfiles) ...target practice.

well you got me on the stock, but i still think that the side pump is clumsy and doesnt look as good as if you just used a fan.

It doesn't matter how good it looks, as long as it does the job! I'd rather pump in fresh air then open a (stuck) cleanout plug and vent with a fan.

Yeah. My goal was not really to have a good looking cannon here. This cannon I built a ways back, I just used it to test the air pump concept.