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.
[img]http://i509.photobucket.com/albums/s340/Killer7777777/ng3.jpg[img]
Gun without silencer.
The barrel is 17.5” long, and the silencer is 15” long.
[img]http://i509.photobucket.com/albums/s340/Killer7777777/ng1.jpg[/img][img]
[img]http://i509.photobucket.com/albums/s340/Killer7777777/ng2.jpg[/img][img]
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 ¾” long.
[img]http://i509.photobucket.com/albums/s340/Killer7777777/ng4.jpg[/img][img]
The back of the gun.
[img]http://i509.photobucket.com/albums/s340/Killer7777777/ng5.jpg[/img][img]
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.
122’
134’
146’
150’
177’
178’
179’
207’
209’
222’
I haven’t 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.
