"Bob Clough" wrote in message news:0FSjd.13$w.4@trnddc02...
snip
I thought wake turbulence
could only happen when significant lift, ie enough lift to get the plane in
the air, is being generated. Therefore, as a landing aircraft, you wouldn't
experience wake turbulence from a departing aircraft until you roll down the
runway past the point of the other plane's rotation. By then you're solidly
on the ground. Right? So does a landing aircraft really have to worry
about wake turbulence from a departing aircraft?

The vortices generated by lift in the departing aircraft aren't the
only form of wake turbulence. When I was based at a class B, I had
numerous problems flying through the churned air generated by the
engines of a departing jet (DC-9s and 727s were the worst). If
spacing is tight behind a departing jet, it would not be unusual to
experience some pitch and roll excursions in the flare.

John Galban=====N4BQ (PA28-180)