3D Robotics IRIS - Manual (Page 8)

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IRIS uses two SF and two SFP propellers. To attach, find the rings shown
below inside the propeller package.
Add SFP propellers to the front-left and
back-right motors and SF propellers to the
front-right and back-left motors with the
writing on the propellers facing up.
SF
SF
SFP
SFP
Writing on propellers
faces up
Propellers
Use the wrench to remove the
nut and washer from the motor.
Place the washers over the propellers, and use the wrench to secure
the nuts tightly on top. Always ensure that the propellers are fastened
tightly to the motors before flying.
Select the ring with the smaller internal diameter
and insert it into the back of the propeller hub.
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