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BrianG · 12.15.2009, 12:47 PM

Mostly startup. Since these systems are sensorless, the ESC needs to get a good rotor positioning signal from a dead stop. When geared high, the motor isn't turning as fast and so the signal is not as good until it starts to spool up. This could lead to cogging, and therefore very high currents which could kill an ESC. When geared lower, each rpm doesn't move the vehicle as much so it is easier on the ESC.

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BrianG RC-Monster Admin Offline Posts: 14,609 Join Date: Nov 2005 Location: Des Moines, IA	12.15.2009, 12:47 PM Mostly startup. Since these systems are sensorless, the ESC needs to get a good rotor positioning signal from a dead stop. When geared high, the motor isn't turning as fast and so the signal is not as good until it starts to spool up. This could lead to cogging, and therefore very high currents which could kill an ESC. When geared lower, each rpm doesn't move the vehicle as much so it is easier on the ESC.