In rec.aviation.piloting Kev wrote:
On Apr 16, 11:15 am, "Maxwell" wrote:
"Kev" wrote in message
It's going to take about 30 seconds to fly a 360 steep turn at
100kts. My wake _should_ descend about 150' during that time (300
fpm). I can't imagine a C172 wake being tall enough to stay in my
way unless something else is ocurring (me descending, or the wake
staying up).

I am certainly no expert on the subject, but I think most of the data on
wake turbulence comes from studies held at or very near the ground.

My searches on the web show the opposite... or at least that there's
studies both at altitude and near the ground. For examples:

http://www.nasa.gov/centers/dryden/a...4-14-DFRC.html




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"NASA research has shown that as large aircraft move through the air,
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trailing vortices tend to remain spaced less than a wingspan apart
while sinking at a rate of several hundred feet per minute. Over time,
the sink rate will slow and their strength will taper off. Research
has shown, however, that vortices can also rise during conditions of
ambient thermal lifting."

"Aircraft Accident Reconstruction and Litigation" By M. P. Papadakis,
Barnes Warnock MacCormick, states that vortices descend 5-10 fps
(30-600 fpm).

Where's the data for C172 sized aircraft?

People are assuming numbers for a specific type of aircraft are
applicable to very different aircraft.

I see no justification for this.

snip rest

--
Jim Pennino

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