When feathered, the propeller blades are aligned in which direction relative to the wind?

When a propeller is feathered, its blades are adjusted to minimize drag when the aircraft is in a situation where thrust is not required, such as during a glide or in the event of an engine failure. The appropriate alignment for feathered propeller blades is straight into the wind, which is the direction from which the wind is coming.

This position reduces the aerodynamic drag on the propeller, allowing the aircraft to maintain better performance while descending. Aligning the blades straight into the wind ensures that the wind passes over the blades with minimal resistance, effectively allowing the aircraft to conserve energy as it descends or glides.

The other options suggest different orientations which would increase drag and could negatively affect the glide performance. Perpendicular or angled positions relative to the wind would create more turbulence and drag, reducing the overall efficiency of the aircraft during a glide. Thus, aligning the propeller blades straight into the wind when feathered is the correct and most effective configuration.