Oh well if you can't get a good bang out of them then I withdraw the suggestion, I was hoping for something that would sound like a howitzer
Does propane have a slower burn rate then acetylene? I've seen guys fill an inverted styrofoam cup and touch it off and it makes a hell of a bang. When I was a kid my uncle Jack took a coffee can and stuck a spark plug in the bottom and used a piece of carbide and dripped water on it then stuffed a rubber ball in the end, when the spark plug was sparked from a safe distance with a coil and a battery that was prety loud too and would launch that rubber ball seemingly out of sight. Kaye how do you know what a fart in a glass milk bottle sounds when you put a match to it