I'm using the Sullivan on my P-51/FS91OS and Cessna 310/2 X OS55AX with no problems. On both systems I use a 7.2V LIPO as the power source and can fly all weekend on a charge. You can set the throttle position to turn it on/off which is nice. It doesn't heat the plugs cherry red so if you flood the engine it will have to be dried out first...otherwise it works fine.