About a month ago, my friends and I had too much time on our hands. And, as most devious college students are wont to do, we decided to make something that went BOOM! And so, we came up with plans for what we now call the Thompson's Nightmare Class Air Cannon. Our version has been known to launch water balloons over 250 feet!
This also happens to be my first instructable. I hope you enjoy!
Here's how to make one:
Step 1: The parts
For the cannon, you will need a bike, an air pump, and PVC (hence the PVC air cannon). Here's a full list of parts:
6 feet of 3" diameter PVC pipe
1 1 1/4" PVC ball valve.
1 3" PVC end cap
2 3-2" PVC reducers
2 2 - 1 1/4 PVC threaded reducers (the 1 1/4" end needs to be threaded to fit the ball valve)
1 Husky 12V inflater with light
All the above can be bought at Home Depot for about $40.
You'll also need an old bike tire.
Tools for this project:
boxcutter or X-Acto knife
Step 2: Cut the PVC
Simple enough. You will need one length of 3" diameter about 4 feet long for the barrel, and one about 1.5 feet long for the air tank. File the edges down once you're done to make gluing easier.