Hovering close to the surface under the influence of ground effect is known as what?

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Multiple Choice

Hovering close to the surface under the influence of ground effect is known as what?

Explanation:
When the rotor is very close to the ground, the downward air from the rotor reflects off the surface back toward the rotor. This interference makes the rotor more efficient at producing lift, so you can hover with less power. That situation is known as hovering in ground effect. The other terms don’t describe this condition: induced flow is the downward air produced by the rotor, induced drag is the drag related to generating lift, and hovering in clean air refers to hovering well above the surface where ground interference isn’t a factor.

When the rotor is very close to the ground, the downward air from the rotor reflects off the surface back toward the rotor. This interference makes the rotor more efficient at producing lift, so you can hover with less power. That situation is known as hovering in ground effect. The other terms don’t describe this condition: induced flow is the downward air produced by the rotor, induced drag is the drag related to generating lift, and hovering in clean air refers to hovering well above the surface where ground interference isn’t a factor.

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