A tutorial on how to make a cheap, pneumatic potato cannon powered by a bike pump from easy to get materials. It's really simple to make, but don't underestimate its power. They can shoot straight through a pretty thick sheet of plywood and break windows. Be smart and be careful when you are using one. Do NOT hold me responsible if you get hurt!!! The pictures might be a little blurry, it's because I took them out of the video I made on how to make it.
Apply PVC Primer and cement to the other piece of PVC pipe and the PVC valve, connect the two and you are done! Now wait 24 hours for it all to dry.
Step 6: To Use
Load the barrel with anything, connect the bike pump to the schrader valve, pump it up (be careful, don't go pumping it up past 75 PSI, around 35 PSI is fine), aim, and with speed and force, open the valve. That's it, I recommend watching the video I made because it's easier to understand. Have fun!