I always try to refer to the motor direction from the pilot's seat perspective;
If you imagine that you are sitting in the pilot's seat of a single tractor motored model plane, the prop will normally turn clockwise which requires a geared motor in a GWS style gearbox to turn counterclockwise.
If you are standing in front of this same plane, the prop would appear to be turning counterclockwise and the geared motor would be turning clockwise.
If you mount the motor/gearbox backwards for a pusher style plane, then the motor has to run in the opposite direction from above to spin the prop in the correct direction.
Clear as mud, right?
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