On Thu, 09 Mar 2006 12:39:02 GMT, Ken Fortenberry
wrote:

What matters is the wind speed seen by the leading edge
of the wing. A plane could become airborne while completely
at rest, relative to the ground, so long as the leading edge
of the wing saw enough wind speed. Think wind tunnel.

That's obvious, that's why I said "takeoff speed was a function of ground speed
and wind velocity/direction" - which will determine the wind speed over the
wing. Taking off with the wind behind you will need more ground speed, and thus
runway, than if the wind is from the front. To say "ground speed has nothing to
do with takeoff" doesn't account for this.
--
Charlie...
http://www.chocphoto.com