I might actually get it done before summer is up! :P
A Pulse jet uses works when a spark is introducted to the fueled chamber of the engine, forcing hot gases out the inlet and exhaust. The explosion causes a void within the chamber and as fresh fuel and air (from the inlet) re-enter the chamber, hot gases from the exhaust also get drawn in and re-ignite the mixture. The process repeats until fuel or inlet air is removed.
Have fun and be safe