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  • foobarFred commented on Meico's instructable Self Contained Pneumatic T-Shirt Cannon1 year ago
    Self Contained Pneumatic T-Shirt Cannon

    PVC was never intended to be used for compressed air, mainly because of the dangers involved in something like this. I built a similar PVC cannon for launching water balloons, not knowing this. We had a lot of fun, shooting one balloon well over 400 ft!It failed after only an hour at around 60-80 PSI while the compressor was refilling the chamber. It was rated for a much higher pressure (180 PSI, I think) and we had previously achieved around 105 PSI. I used a "T" shaped air chamber and when it failed one branch of the "T" broke off (not cleanly at the seam, but with a jagged edge around the seam) and shot through the air like a missile. Had I been in front of it, it would have seriously injured me. And, I was lucky, as it's far more typical for something like this t...see more »PVC was never intended to be used for compressed air, mainly because of the dangers involved in something like this. I built a similar PVC cannon for launching water balloons, not knowing this. We had a lot of fun, shooting one balloon well over 400 ft!It failed after only an hour at around 60-80 PSI while the compressor was refilling the chamber. It was rated for a much higher pressure (180 PSI, I think) and we had previously achieved around 105 PSI. I used a "T" shaped air chamber and when it failed one branch of the "T" broke off (not cleanly at the seam, but with a jagged edge around the seam) and shot through the air like a missile. Had I been in front of it, it would have seriously injured me. And, I was lucky, as it's far more typical for something like this to shatter when it fails sending shrapnel in every direction.While it's a fun project, I highly recommend using a metal pipe that's intended to contain pressurized air, rather than PVC.

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