Try unplugging the main motors and then plug in the battery.,
Now the only motor that should work would be the tail motor.
When you move the stick forward and backward, does the tail
motor speed up (forward) and slow down (backward) ?
You would probably need to have the throttle stick up some to get
the tail motor to actually turn at all. If the motor isn't turning
much, then maybe you have a bad tail motor.
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