In rec.aviation.piloting Mxsmanic wrote:
writes:
Upon what do you base the assumption your wake should decend 150'?
All wakes descend; they have to, otherwise the aircraft could not stay aloft.
They move at a few knots, which still amounts to some 500 fpm.
No, they don't, and no it doesn't.
You have nothing to back up what you say.
I have never heard of any study of the wake properties of GA aircraft
and the wake of a C172 is very different than the wake of a 747 ...
Since you haven't heard of any study of the wake properties of GA aircraft,
you cannot possibly know whether the wake of a C172 is "very different" from
that of a 747 or not. Oops!
If I fly through the wake of a 747 I risk things like suddenly finding
myself inverted or structural failure.
If I fly through the wake of a C172 I feel a slight bump.
Oops!
In fact, the general principle is the same for all aircraft wakes. They
always move downward gently. You cannot catch them in a turn unless you move
downward, too. If you are in rising air, the wake might remain stationary
relative to the ground, but then your aircraft would be rising, so you'd still
have to descend relative to the surrounding air in order to catch your wake.
And smoothly rising air isn't that common, although it's not that rare.
Is this knowledge based upon your many years of playing the Flight
Simulator game?
Just because playing a Microsoft game gives you no basis for understanding
something that many thousands of people have experienced does not mean
that it doesn't exist.
--
Jim Pennino
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