hovering in ground effect

A helicopter hovering at a height that is equal to or less than the span of its rotors. A helicopter can hover in ground effect at a higher density altitude than it can hover out of ground effect. A helicopter requires less power to hover in ground effect than hover out of ground effect. The power requirement varies directly with the height above ground level.
Hover out-of-ground effect.
Hover in-ground effect.
A helicopter hovering at A requires 55% torque. It will require 58% if it were to hover at B.

Aviation dictionary. 2014.

Look at other dictionaries:

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