Show us your pneumatic spud gun! Discuss pneumatic (compressed gas) powered potato guns and related accessories. Valve types, actuation, pipe, materials, fittings, compressors, safety, gas choices, and more.
OK, I was actually joking there, but I guess I could draw one in paint quickly : http://s203.photobucket.com/albums/aa95 ... lvalve.jpg
Thats just the basic concept of it, so you can use it and adapt it your specific cannon. Do you understand it?