I picked up a P3S after flying a P2S for a while. P2S had constant power with normal prop noise. This P3S has a gimble "squeal" and almost sounds like it has a sputter or variance in power feed. I have hovered it and flown 360's at varying power levels and noise and minor power surge remains. Noticed 3 hot gimbles and one warm one after flight, so I am perplexed if problem is x3 or x1. Can the motor assemblies be lubricated with something like graphite or dielectric lubricant to see if noise quietens and power stabilizes? I am versed in flight, but not mechanics. Thanks!
