I finally started running this motor in the CRT.5. On 4s1p A123(11.6V under cont. load), the supplied motor fan is needed for sure. Gets too hot for my comfort. The pro of the motor, is the "Build-in" dragbrake of the motor. For those that like dragbrakes for SC trucks, this is the motor. It's hooked up to Luciano's 200A ESC.