I Have a skygate hawk that was already built and the first thing I did was put a servo amp meter on the radio to measure the amp pull.
Yeap, 1.5 amps ... took the elevator servos off and the amps went down to .5 amps, the rod holding up the elevator was causing the digital servos to adjust too much at different points causing too much whine at resting too.
On another model something similar happen to a digital steering servo except it wasn't whining loud at all it was just adjusting so much at radio center that it was pulling a lot of amps from the BEC.
The steering pin would stick around the center point steering causing the constant adjustment but wouldn't happened every time also the servo was hot .. greased up the steering pin and that fixed the issue
Bottom line; get a servo amp meter and make sure none of the servos are over-amping ... ESPECIALLY ... if the servos are digital.
my 2c
Last edited by erh7771; 03-04-2019 at 04:49 PM.