Ben wrote:

It looks like in this wind tunnel picture that the airflow is deflected
downward even at quite a distance above the wing.

http://www.jefflewis.net/graphics/ai..._P0001845.html

It seems like even in
high tow you might still be in an airstream that is deflected downward
significantly compared to the airstream that the towplane is feeling.

The other thing it shows is that, to keep a normal AOA on tow, you'll be
pitched up further than in free gliding flight.

If you hit PREV a few times in that sequence there's a nice head-on view
of smoke tracing the tip vortex. The top of the vortex slopes slightly
down as it travels rearward, so away from the ground there is no
significant upward flow behind the top plane's tip as somebody else
suggested.


--
martin@ | Martin Gregorie
gregorie. | Essex, UK
org |