In this Instructable I will be describing another design for the all-popular pneumatic (air) cannon. My version is similar to many of the other ones on this site, but my design was my idea so don't say I copied it from you. This is very simple to build, costs little, does not require alot of skill, and is fairly "safe" (especially if you are careful with it).
This is a weapon and can be very hazardous if used irresponsibly or used at all. NEVER, EVER point this at anybody because, despite its benign appearance, It could really mess you up. What you do with this is your responsibility, not mine. It is advisable to check your local laws before building this, it may not be legal where you live. Always treat guns liked they are loaded. Use eye protection. Use common sense. Plastic bottles like the one used in this Instructable can be prone to violent failure which could result in injury. Please take adequate safety precautions and use a PVC air chamber when you intend to use higher air pressures than what has been recommended. Happy shooting!
Step 1: Materials
1/2 inch pvc piping (the higher rated, the better)
1x 1/2 inch T connector
1x 1/2 inch ball valve
1x empty 2 liter bottle
Duct or electrical tape
Bike tire valve