Parrot BLUEGRASS Manual De Usuario página 19

INSTALLING THE PROPELLERS
When the drone is turned off, screw the threaded
propellers onto the Parrot Bluegrass motors, holding
still the base of the engine. The threading serves as
coding for the positioning of the propellers on the arms
of the drone (scheme B).
Ensure that the propellers are correctly screwed on
before take off.
A
B
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