Out of ground effect hover typically requires more power due to what?

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Multiple Choice

Out of ground effect hover typically requires more power due to what?

Explanation:
The main idea is how the rotor sends air downward and how that energy loss changes with distance to the ground. When you hover, the rotor must accelerate a column of air downward to create thrust. In ground effect, the nearby surface confines that downwash, so the induced velocity is lower and the rotor needs less power to produce the same thrust. Out of ground effect, the downwash can spread more freely, so the induced velocity for the same thrust is higher, which increases the induced power needed (P = T × v_i). Because of this higher induced velocity in the downwash, hover out of ground effect generally requires more power.

The main idea is how the rotor sends air downward and how that energy loss changes with distance to the ground. When you hover, the rotor must accelerate a column of air downward to create thrust. In ground effect, the nearby surface confines that downwash, so the induced velocity is lower and the rotor needs less power to produce the same thrust. Out of ground effect, the downwash can spread more freely, so the induced velocity for the same thrust is higher, which increases the induced power needed (P = T × v_i). Because of this higher induced velocity in the downwash, hover out of ground effect generally requires more power.

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