Hi, I had followed the thread on H2O2 some time back. I've got an Idea which might sound too Crazy to work. But there might be someone just as crazy as me, who might have tried this before. How about a Small Aluminium pipe(2" Dia) with a small DC motor powering a small Propeller to force air through the Pipe. Slightly ahead, there will be a small copper tubing with a very small orifice to supply some combustible gas(acetylene or propane) into the chamber. And there would be a small spark plug or whatever to ignite the air/fuel mixture. I guess the combusted gases would rush out of the other end of the pipe, creating a bit of thrust. I don't know if this would work. Adding a reed valve like the one in V1 Pulse Jet engine between the propeller and the combustion section might make it better. I believe the lenght of this contraption may be no more than 4 to 5 inches. Anyone has ever tried this before? Any better/simpler Ideas ? Jeethu Rao -- http://www.piclist.com hint: To leave the PICList mailto:piclist-unsubscribe-request@mitvma.mit.edu