Neu motor rpm speed question for BrianG

[VintageMA]

Brian - I have seen in a bunch of threads that you are preferring lately to run the Neus up at the higher end of their rpm range (~50k) saying they are showing to be more efficient.

I wanted to ask you about this and see if you could expand on your thoughts a bit because the little bit of testing I have tried hasn't really shown the same thing, but I know you've got a lot more experience with all of this stuff.

I was running a 1512 2.5d (2050kv) at 4S, 5S and 6S - each time changing the gearing to keep speed as close to the same as possible. Obviously on 4S there was a lot of current being pulled. 5S showed a bit of a drop in motor temperature and more efficiency, but with 6S (~45k rpm) the temp were definitely higher than both 4S and 5S. (this was all in 1/8 buggy)

Was wondering if you could explain how things have been working for you. Also - have read over the past few years that smaller motors are happier spinning at higher speeds than larger motors. So does this mean that a 1506/1509 would be happier at 50k rpm that a 1515 or a 1521? That would seem to make sense as the bigger the size of the motor, the lower the kv ratings - even on the hottest winds.

Thanks