[Just go Play]

For feigao motors 30-35k is the range to shoot for.

I have several friends that fly heli's and run neu motors at upwards of 50k rpms with no problems at all. I also run a 1515 1Y in a revo and for bashing find that 5s is just right. For racing I would likely drop to a 4s pack though as 5s would be over kill for all but the largest tracks.