3D Robotics RTF Aero - Manual (Page 10)

10
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.
3
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.