- 800mm long 50mm barrel
1200mm long 40mm golfball barrel
1000mm long 50mm chamber
25mm pneumatically actuated sprinkler valve pilot
Male quick-connect for the fill valve
50mm plywood o-ringed piston machined down on a lathe and water sealed.
50mm female threaded port
40mm piston travel
Versatile Antenna Launcher or VAL for short, is a 2" piston valve pneumatic I made for a school project. It's main function was to shoot a fishing cable attached to a pocket nerf but i've also made it very versatile.
How-To: Build the V.A.L Cannon
http://www.instructables.com/id/Golfbal ... That-Shoo/
Well here's the cannon after a new upgrade/downgrade as i've removed the stock. Paintjob has suffered a bit and I just realised it has almost been two years since I posted the cannon.
Close up of piston housing, pilot setup and removed stock
Close Up of Piston Housing and Pilot Valve
View through Barrel Support
View through Barrel Port
Close Up of back of Piston Housing, Fill Valve and Pressure Gauge
Over view of Cannon with 50mm Barrel and fishing line fitting
Close Up of Breech Loading Mechanism with Nerf
Over view of Cannon with Golfball Barrel
Breech Loading Golfball Barrel
Piston with Bumper and Threaded Adapter
Sealing Face of Piston
Piston size comparison
It can shoot golfballs, potatoes, pocket nerfs, deodorant cans or anything else that fits in a golfball or 2" barrel. One of my main features I wanted this gun to have was breech loading. I learned from the <A HREF="http://www.spudfiles.com/forums/viewtopic,p,100616.html#100616">SGA</a> that having to unthread the barrel from the adapter to load a potato, clean the barrel or having to use a ram rod to get a projectile to the bottom, was taking a toll on me.
But I wanted it to be able to have interchangeable barrels while keeping the breech loading mechanism simple. I got the idea from a nerf launcher posted on Youtube that we had a discussion about. The main goal was to build a cannon that would pass me the assignment but still be powerful so I didn't waste my money.
For the assignment the operating pressures will be 30psi max, which sends the nerf with cable attached, about 70m. I've taken this up to 90psi so far, hopefully more but it drains my compressor fast. Everything seems to work perfectly as well, I learned from my mistakes with the SGA. This works first time, every time and seems a lot more powerful.
I documented the building process with pictures so I can replace my old piston how-to. It may take me a few days to write it up. If you're wondering how the breech loading works, I just bored out two 50mm PVC tee's so they slide over 50mm pipe. I then joined them with an adapter and made the right height adjustments. The barrel simply slides through the top tee and locks into the coupler attached to the female threaded adapter.
To load, simply pull the barrel out of the coupler, load your projectile and close it.
New video [12/02/2010]:
New Video [10/05/2010]: