I have to agree, using oxygen is a dangerous additive. If you are adding more than smidge, you're in danger if you finally get the mixture right and it ignites properly. Propane will only ignite between 2.5% and 9.2% by volume with air at sea level, so you may well be under fueling it. Get it all s...

Hello, I have been using a blue canister of Bernzomatic propane as fuel. My propane fill chamber is 1/2" ID and 12" long with an integrated pressure gauge. My combustion chamber is 3" ID and 24" long. I get reliable combustion when I use pure oxygen to supplement my propane fuel, but using only prop...

https://i.imgur.com/ijyQX3J.jpg I built a standard combustion cannon with an auxiliary fill chamber and an integrated pressure gauge. I was disappointed with the performance when I used only propane, so I decided to add an additional valve that leads to an oxygen gas cylinder. I found that the best...