Two props are for clockwise (CW) rotation and two are for counterclockwise (CCW) rotation. It is crucial when replacing them to replace with the same color, and ensure the directional arrows on the new rotor match the directional arrow printed next to the motor the prop us being attached to.
Used with permission, copyright 2019 Helimax. Copyright 2019 Brey Corp. t/a Hobby Works
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