Instructables

Another Air Cannon

Step 7: Now to shooting

To use the cannon, take a bike pump and attach it to the bike tire valve. Pump it until the bottle is firm like a basketball. Slide whatever you are using as ammo down the barrel. Then hold the bottle against your hip and aim the barrel somewhere safe. When you are ready, twist the ball valve open as quickly as possible and watch your projectile fly into the sky!
 
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