well this seems to support an argument that i had about reversing direction. it appears that it is possible to reverse direction and in the exact same method I postulated as possible. so either the back emf does come in correctly in reverse or its not used in a sensored application. seems like it would be easy enough to diagram the rising and falling edges of a coil versus sensor arrangement.

Where to learn more about electronic ?

Well, to be precise, it is possible to swap two wires, but you also have to swap two wires of the sensor cable. After that, the timing of the sensor board has to be adjusted accordingly.
1) switch motor cables B and C
2) switch Hall sensor A and Hall sensor C which is #2 and #4 on the sensor cable (if you have a ROAR certified cable)
3) adjust the timing of your sensor board which might not be possible without doing some modification.

If you mean putting the motor and the main gear to the other side, don't bother, that won't change the rotating direction of the wheels.
Andi

here GB..
Electric RC info, how-tos and such - TJinTech

Hello!

I am not expert for electronic components, so I have next question. I decided to place a JR 2 lead on/off switch between receiver and cooling fan for brushless motor. It is these OK, because I do not want to burn out something? In summer time is cooling of brushless motor needed but in the winter time the cooling is not necessary so instead of disconnecting plugs out of the receiver I decided to place on/off switch.

On/off switch:
https://hobbyking.com/en_us/2-wire-r...en_us_products

Thank you.

No problem whatsoever with using a switch inline for a motor cooling fan.

But why not let the fan spin?

I have installed heatsink with fan, so I think that the fan is not needed in wide open tracks where is not so much acceleration of brushless motor and the motor is not heat so much, so maybe if I switch the fan off I will save some energy for racing.

The fan is not even taking 1% of the energy the motor draws, you will not save a thing.

No, some of my Hobbywing ESCs don't support it. My LRP doesn't either.

Reversing the channel on the radio doesn't change the motor direction on a sensored ESC. The calibration phase will determine whether a high or low signal is throttle.