hi max are great motors. but i found they do get very hot when loaded up with a large prop on high volts. i was using a 10x4.7sf apc on and 8.4v nimh pack it ran fine. when i stuck a 1050 11.1v on it it was not very hot but i did notice heat. went down to a apc 9x3.8 slow fly prop and it pulls as hard as ever. its its too hot on the power setting you like try the next one up, like the 28/12