Question to Mxmanic

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

Not necessarily. Visualize that I begin my turn over a field where
the air is rising slightly. The rest of my turn is over another area
(lake perhaps) where the air is static. I am not descending through
the rising column yet I manage to hit my own wake because it was held
in place.

Since these would be very unusual circumstances, they cannot substantiate the
claim that pilots routinely meet their own wakes in 360-degree turns.

Yes, these would be very unusual circumstances in the Microsoft
Flight Simulator game.


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Jim Pennino

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"Kev" wrote ...

Of course, LIGHT does not mean "light aircraft". Some 152s are
vortex HEAVY in the case of big instructors and students ;-)

I see your point ;-)

However, I've never seen a condensation trail behind a C152 wingtip. Not
that it necessarily means anything.

But you made me think about air viscosity, i.e. friction that dissipates
turbulence. One might argue that a C152 flies in relatively "thicker" air
than a B757 and thus a vortex or downwash might not propagate away from the
flightpath as easily. How far from a bumblebee can its downwash be felt?

Just rambling ... ;-)

Tom L. writes:

It doesn't have to continue to sink forever. It can stabilize its
position at some point.

It will sink indefinitely unless some other force acts to stop it. In theory,
it will sink until it reaches the ground.

In other words, in theory, an aircraft lays down a swath of downwash from the
time it leaves ground effect on the runway until the time it lands in ground
effect again. The entire swatch theoretically touches down on the ground
eventually.

E.g. if the vertex radius is 15 feet and sink rate 20 fpm, we hit the
wake after a 30 second turn.

Twenty feet per minute is too slow. The downwash will move at at least a few
knots, and even three knots is 300 fpm.

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

I don't know, but I'm going to find out! I can envision an aircraft with
light wing loading, like a Cessna for instance, compressing the air
locally as it creates lift. After passage of the wing, the lift created
downwash would rebound upward, kind of like skipping a stone on the
water.

Virtually no compression occurs at the speeds of a Cessna. Compression is
only an issue at high speeds. At low speeds, air behaves very much like an
imcompressible fluid.

Wave your hand through the air. Did it feel like an imcompressible fluid?

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Jim Pennino

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In rec.aviation.piloting Mxsmanic wrote:
Tom L. writes:

It doesn't have to continue to sink forever. It can stabilize its
position at some point.

It will sink indefinitely unless some other force acts to stop it. In theory,
it will sink until it reaches the ground.

Do you get your physics from Microsoft Physics Simulator.

snip remaining babble

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Jim Pennino

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writes:

Do you get your physics from Microsoft Physics Simulator.

I got this from aviation sources.

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writes:

Wave your hand through the air. Did it feel like an imcompressible fluid?

Yes. Does your Cessna provide equivalent airspeed?

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In rec.aviation.piloting Mxsmanic wrote:
writes:

Wave your hand through the air. Did it feel like an imcompressible fluid?

Yes. Does your Cessna provide equivalent airspeed?

Did you use Microsoft Air Simulator to do this?

OK, now wave your hand through a real fluid, I'd suggest water.

Did it feel the same as waving your hand through air?

What Cessna?

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Jim Pennino

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Wrong.

mike

"Mxsmanic" wrote in message
...

And it will be so weak that you won't feel it even if you run into it,
which
you won't do unless you descend.

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Not if properly done.

mike

"Mxsmanic" wrote in message
...
JB writes:

You are such an idiot! Probably every GA pilot-in-training with a
C152/172 or something similar has experienced hitting their own wake
when performing their first steep turn with an instructor.

Steep turns tend to be descending turns.

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