Okay, thanks for the feedback.

I'll shelve the O2 for now until I get around to building a metal cannon, and just build a propane meter.

Thanks again.

Sorry, I should have clarified. I wasn't considering a pressurized hybrid, but a propane cannon using oxygen at atmospheric pressure. All the oxygen is for is to enrich the fuel/oxygen mixture to reduce the fuel-to-air ratio and get a cleaner combustion. Does anyone have any experience with this des...

Hi, My friend and I are upgrading his miniature spud gun to accept a Propane-Oxygen fuel mix. It has a small combustion chamber (about 75 cubic inches, or ~1100 cc). It's built from ABS. Our design is to use an oxy-propane cutting torch as a regulator to provide the fuel mix from tanks of propane an...