thank you for the infor .I had 2 flight to day 2 min. after landing the motor temps reach 150 degree with 86-89 weather temps !! I think maybe need more air flow to the motor. well!! I will working on the air ducting to night..! let see how it work tomorow , prop 21x13w tp 5300-s4p takeoff weight 10lb 11oz I will post some photor soon.. T LAM