In this video we cover 3 common misconceptions in RC. Links to RCexplained T-Shirts:
We first start by talking about low kv and how it is know for being able to produce higher torque. What is interesting about this is after we run through the calculations, we can see that the amount of total torque output is actually identical for each motor. In order to produce the same amount of torque from a higher kv motor, the amount of current drawn must increase. The higher current is offset by using a lower voltage where the lower kv motor will require a higher voltage to get the same RPM output.
The second item that we cover is the definition of cogging. Cogging is more commonly known as the lack of synchronization between the ESC and sensorless motor. In fact this is not the definition of cogging. Cogging is the relationship that occurs between the iron core known as the stator and the magnetic rotor. Interaction between these two components take place as the magnetic is attracted to the iron core. The interaction that takes place causes torque ripple to occur.
The last item that is covered is based on a brushless motor vs voltage. It is known that higher voltages can electrically destroy a brushless motor. This is not necessarily true as we know from previous videos that current is what destroys a motor. Heat is what can cause a motor to fail and heat comes directly from the amount of current that we draw. More current = more heat.
As a bonus topic, we cover cavitation in RC boats. What is the definition of cavitation? Watch the last part of the video for the answer.
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