If the goal is to give the student an easy-to-grasp concept, ground cushion
is just fine *as an introduction to the discussion.* If the goal is to use
technically correct phraseology at all times whether it penetrates the
student's skull or not, then reduction in induced drag and downwash angle do
the trick.

Bob Gardner

"Cubdriver" usenet AT danford DOT net wrote in message
...
On Mon, 25 Feb 2008 09:46:30 -0800, "gatt"
wrote:

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

Do people still teach this?

All I can say is, if you rely on that ground cushion to soften the
impact, you will be sorely disappointed.

Blue skies! -- Dan Ford

Claire Chennault and His American Volunteers, 1941-1942
new from HarperCollins www.FlyingTigersBook.com