In rec.aviation.piloting Mxsmanic wrote:
Snowbird writes:

Do you have a reference saying this is always the case?

Every reference I've checked says so. They sink at a variable rate, but
usually at least 150-200 feet per minute, sometimes much more.

They have to do this, because it is the reaction to forcing the downwash
downward that produces lift.

Maybe the propwash?

I'd expect the propwash to be drawn down with the downwash, but I'm not sure.
I would not expect the propwash to be significant after two minutes.

What you expect and what really happens in real airplanes are obviously
two different things.

Any object in the air with an airspeed greater than zero has wake
turbulance.

The precise details of that turbulance depend upon the shape of the
object, the speed of the object, and the condition of the surrounding
air.

The wake turbulance of transport category aircraft has been widely
studied because such turbulance is dangerous to other aircraft.

The wake turbulance of light aircraft has not been studied to such
a degree, if at all, because the worst that happens when you fly
through it is you experience a little bump, i.e. no one cares
about it.

Therefor, it is highly unlikely that you will be able to find any
information on the typical characteristics of the wake turbulance
generated by a Cessna 182, or any other GA aircraft other than from
the experiences of real pilots.

--
Jim Pennino

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