Step 6: Troubleshooting
Okay, so you're losing air pressure in the pressure chamber. This is because you've got a leak somewhere. No matter how much PVC cement you used, leaks are usually inevitable. But there is only one part of the air cannon that they're found at-the pressure chamber. To seal them, you have to find where you're losing pressure. There are methods to finding air leaks that range from simply listening for a fizzing noise and trying to find it that way, by coating the pipe with a film of soapy water and looking for the formation of bubbles due to escaping air, or even submerging the unit under water and looking for streams of bubbles traveling upwards. All of these methods work with different results. It's how you seal the leak that matters. Any other weird problems, please leave a comment southward on this instructable, and I'll see what I can do.