It's an issue with sensorless brushless motors/ESCs, causing stuttering movement when accelerating from a standing start.
It's caused (AFAIK) by the pulsing of the ESC and the rotation of the rotor getting out of sync (the best metaphor I can think of is the hula hoop - get your gyrations timed wrong, and the hoop falls to the floor). Sensored systems don't suffer this (the sensor cable provides the ESC with feedback about the rotor position), and some sensorless systems fair better than others.
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