I was going to take my hunter vtail 500 on a test flight and the front left motor was spinning and it suddenly stopped rotating and started vibrating.
Hi,
I’m actually not completely sure why it would stop rotating, but there is a chance that there is something loose or disconnected inside your motor, so check that out.
Here is a cool website dedicated just to the hunter vtail 500, so these guys may be able to help you more.
Showing off my X8 TBS Endurance Quad : Multicopter - Reddit
Most of the time, this is a result of broken wires going inside the motor.
Check at the base of the motor where the three wires go inside the casing of the motor.