Originally Posted by britinoz
I have a problem with my model. When I open the throttle, the tail motor starts OK and the rudder imput varies the rotor speed OK, but the main motor does not always start, instead a high pitched noise is heard .The model will not fly in this condition. now is this simply the motor needs to be replaced or a PCB problem.I am sure this would be a similar Solo Pro promlem. I am a bit new to these little machines.
I think your main motor is done for. At least, if the rotor still rotates smoothly when doing this manually. If the main shaft is binding, the motor won't be able to turn the blades.