What makes them look BIG is the fact of the amount of wire involved in routing these systems into the car, plus they do tend to run hot.
I have installed a 18th brushless in an RC18T and the peice parts are very small, but then you got to add the three wires from the motor to the ESC and bang goes the el-neato wiring.
What's it like to drive a sensored system, mine is a sensorless and there is an occaisonal loss of power, usual transitioning between reverse and forward, not something to worry about in racing though.
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