Answer :

Final answer:

Propeller feathering ability is designed to alter the pitch angle of its blades when the engine is shut down or during certain flight conditions, reducing drag and improving aircraft efficiency.

Explanation:

The ability of a propeller to feather is primarily designed to alter the pitch angle of its blades when the engine is shut down or during certain flight conditions. Feathering the propeller reduces the drag caused by the windmilling effect, increasing the efficiency of the aircraft. By adjusting the pitch angle, pilots can optimize the performance and control of the aircraft.

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