I was witness to Jack's flights yesterday. In both cases after being airborne about 3 minutes the plane went into flamethrower mode. This has really got us as it happens on full power. The sound is exactly like a pulsejet [German buzzbomb] with flame extending out the rear 4-5 feet. Somehow to much fuel is entering the combustion chamber and the unburned portion is entering the pipe and igniting there. Jack said the ECU was allowing the engine to run above 195,000. That combined with his low temp. readings could be a big problem. Jack , double check your temp. probe and make sure it is inserted far enough into the gas stream. Also at this point a new jet pipe might be in order once you get things worked out. I've got problems of my own as you know. Good luck Doug