Ahah! This is great information. If it is not qualified with "on
certain days" or "at low altitudes" it would mean that rising air has
nothing to do with it. Inclusion of the phenomenon in the simulators
tends to indicate the same thing.

Now, if we combine this with the information from the article that Kev
found that lists descent rates and vortex radii, we have a reason to
be really puzzled!
(The article is he
http://www.airpower.maxwell.af.mil/a...ug/carten.html)

According to that article, the vortex descent rate for B-2707 (is it
the same as 707?) is over 700 fpm and the vortex radius is only 11'.
If this is true, by the time the arcraft finishes it's full turn the
vortices are hundreds of feet away.
So what causes the bump? What else is going on here?
Or are the vortices data incomplete or wrong?

- Tom


On Tue, 17 Apr 2007 16:46:16 GMT, rq3
wrote:

Yes, they do. I just asked a friend with 26,000 hours. He confirmed that
DC-8's and 707's do get a bump as they cross their own wake in a 360
degree constant altitude turn. He also said that some Category D
simulators include this effect in their motion repertoire.

Rip

Tom L. wrote:
...
Does anyone know whether big aircraft experience the bump at the
conclusion of their steep 360s?

- Tom