b(1) : to change the angle of (airplane propeller blades) so that the chords become approximately parallel to the line of flight also : to change the angle of airplane propeller blades of (an engine) in such a manner. (2) : to change the angle of (a rotor blade of a rotorcraft) periodically in forward flight.
Feather | Definition of Feather by Merriam-Webster
Feathering Propellers in Airline Transport Operation - JSTOR
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by MG Beard · 1939 · Cited by 1 — explain. First, by 'stopping the rotation of an engine and propeller in flight, it protects the air- ... the blade to "feather" or, in other words, rotate to an angle of.