On Feb 26, 7:04*am, Bertie the Bunyip wrote:
"gatt" wrote :



In the book "Takeoffs and Landings" by Leighton Collins--who is
referenced in "Stick and Rudder"--there is no mention of the term
"ground effect."

Rather, Collins talks briefly about "ground cushion" and how air
"piles up" beneath the wings.

Do people still teach this?

Wel, it's a rose by any other name sort of thing.. Basicaly what's
happening is the air around the wing's pressure is influenced by the
ground. You have a high below the wing in flight and it gets higher and
influences the way the air flows around the wing keeping it laminar longer..
( slower)


I thought it was purely due to a reduction in induced drag. This
causes the lift vector to be larger.

Cheers