I am doing a science project on the Effect of Different Gases on propulsion of a Ping Pong ball. By looking at the picture, you can see that it's a pretty basic launcher. I twist the combustion chamber to spray my gases in there, twist it back on, and then put the Piezo-Electric Igniter through the small drilled hole. I ignite it, but nothing happens. The gas isn't igniting. I've used 5 different gases and I don't understand why the gas won't ignite. The igniter works but is it not powerful enough? Any tips would help.