I agree that you are thinking to fast. You need a slower motor. Both the Lehner 5300 and the MM 5700 are going to overheat on that setup. I'd recomend something more along the lines of BK 9 or 10s. I've learned that Lehner basic motors don't do well with lower voltages. Even 3c lipo isnt enough to make them happy. Lehner 1920 or 1930 motors.......now thats a different story.