Autofeather is a feature of the engines on some
turbopropor piston engine aircraft. When the power being produced by the engine drops to the point where it is not contributing to thrust, the propeller will go into a feathered mode to reduce drag.
An automatic feathering system was first introduced on the
Martin 4-0-4aircraft, a piston engine airplane. The system was designed to automatically feather an engine that failed during takeoff or initial climb.
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