(OGE) Out of Ground Effect provides normal lift. Normally speaking.
(IGE) In Ground Effect provides greater lift. But, as Gordon Leishman says
"The [ground] effect has long been recognized but the aerodynamics are still not fully understood."
(UGE) Under Ground Effect provides the greatest lift. But, it is even less understood.
This phenomenon is most noticeable at six feet under. Most people say that one hovers like an angel. Others, who have been naughty, dispute this and say that there is one hell of a sinking feeling.
