On Sat, 16 Sep 2006 08:53:53 +0200, Mxsmanic
wrote in :

Larry Dighera writes:

No. It's like increasing the angle of attack on a thicker wing
section which stalls at a lower speed.

Ground effect is completely different:

http://en.wikipedia.org/wiki/Ground_effect
The term Ground effect (or Wing In Ground effect) refers to the
increase in lift experienced by an aircraft as it approaches
within roughly 1/4 of a wingpspan's length of the ground or other
level surface (such as the sea)

http://www.avweb.com/news/airman/185905-1.html

But if you are hopping over small obstacles near the runway, you're
probably very close to being within the distance influenced by ground
effect, aren't you?

That's a reasonable assumption, but I believe you'll find that the
technique described will work at altitude as well, so it's not
dependent on ground effect.