RC-Hangout

Took my old girl for a wee test hover in the back garden as i had been working on her some weeks back, changed torque tube and main shaft bearings etc.

She spooled up no bother then there was a slight shudder which went away as i increased throttle and lifted a few feet off the ground.
Then it happened , in hover it sounded as if the motor was increasing and decreasing all the time? High and low high and low.

My first thought was ESC setting or a battery charge issue?

Any ideas?

Well check the battery to make sure it wasn't LVCing on you. If you use a governor, maybe try turning that off and see if it continues. Check pinion set screw, jesus bolts, etc. might be something actually slipping.