3D Robotics Aero-M - Manual (Page 26)

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Propeller
Locate the rings inside the propeller package. Remove the ring with
the second-largest internal diameter, and insert it into the back of the
propeller hub.
Remove the nut and the washer from the motor, add the propeller with the writing on the
propeller facing towards the nose of the plane, add the washer and the nut over the propeller,
and tighten the nut.