On Apr 17, 12:24 am, "Maxwell" wrote:
"Kev" wrote in message
http://www.airpower.maxwell.af.mil/a...ew/1971/jul-au...

"Cruise altitude vortices usually level off at about 1000 feet below
the altitude of the aircraft as their density comes into equilibrium
with that of the surrounding air. Decay processes then take over. "

Don't underestimate the value of the words "usually" and "about" in that
sentence. You are still trying to absolutely describe something that is very
dynamic.

True. So I guess we could all agree that where the wake goes, depends
on the surrounding atmosphere and aircraft profile...

Still... if it stayed at the same altitude most of the time (contrary
to NASA reports), or was over 100' tall (as some tried to claim at
first), then EVERY student pilot could hit their own wake all the time
grin.

Kev