It is an incredibly powerful air cannon. Without the silencer it is 40 long. I did not design it for battle practicality. I do not intend to shoot people with this gun. The only reason for this project was to see how much power a homemade gun could have, and this is certainly not the most powerful gun possible. It was just an attempt at a powerful nerf gun, and a fun project.
Gun with silencer.
Gun without silencer.
The barrel is 17.5 long, and the silencer is 15 long.
The breech is a creative bit of engineering, I had to make. It consists of a piece of ½ PVC pipe with a 1 ½ notch to load the darts with. On either end of the notch is a piece of FBR that has been cut in half then hot glued to the ½ PVC. The sliding part is a piece of 1 PVC that is 2 Ύ long.
The back of the gun.
The front of the gun with the valves electrical box etc.
The firing valve is a 1 sprinkler solenoid valve. The galvanized pipe behind it is all 1. I bought the wrong type of regulator for this type of gun, it is a flow regulator, instead of a pressure regulator. That is why the ball valve is there. To prime the firing chamber all I have to do is just barely crack open the regulator, and then open the ball valve until I have about 25p.s.i. in the small pressure chamber. Then I close the ball valve, and fire.
Radio shack sold me a bad switch so I have not been able to use the electronic firing system yet. Until I can get a new switch I will use the manual bleed.
The main pressure chamber is 24 long and made out of 2 PVC. I pressurize it with a bike pump to 60p.s.i. this allows for about 10 shots until the main PC is at 25p.s.i. and is no longer at a usable pressure.
The ranges with the normal barrel and 25psi. in the small chamber and the gun at a 0 deg. angle.
I havent perfected my Stefan making technique yet , so the ranges vary quite a lot.
Now for the fun part. With the gun at an angle of about 25 deg. a 38 barrel, and 65psi. in the small PC the farthest I have gotten it to shoot is 378, Keep in mind that that was the best shot out of three.
I was wondering if any one has tried lubricating the barrel with something, and if so what did you use? I am looking for ways to increase range. Thanks in advance.
Edited by Killer 7, 09 August 2008 - 10:42 PM.