Question to Mxmanic

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.

--
Transpose mxsmanic and gmail to reach me by e-mail.

On Apr 14, 7:18 pm, 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.

Good grief.


Bertie

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

Remove .spam.sux to reply.

Mxsmanic wrote:

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.

Note that we were talking about turns at either 45 or 60 degrees bank; with
a typical trainer flying at, say 90 or 100 knots, a 360 would be completed
under say, 35 or 20 seconds respectively. Now, if your numbers of 200
feet per minute are correct (and don't take it personally if I have my
doubts), the turbulence would have gone down, by about 115 and 67 feet
respectively. Considering that the acceptable range of error in the PTS
for a private certificate is +/- 100 feet (for a 45 degrees of bank), it
is indeed possible to bump into your own turbulence, even using your
numbers.

--Sylvain

Sylvain writes:

Note that we were talking about turns at either 45 or 60 degrees bank; with
a typical trainer flying at, say 90 or 100 knots, a 360 would be completed
under say, 35 or 20 seconds respectively. Now, if your numbers of 200
feet per minute are correct (and don't take it personally if I have my
doubts), the turbulence would have gone down, by about 115 and 67 feet
respectively. Considering that the acceptable range of error in the PTS
for a private certificate is +/- 100 feet (for a 45 degrees of bank), it
is indeed possible to bump into your own turbulence, even using your
numbers.

If they descend, yes. QED.

--
Transpose mxsmanic and gmail to reach me by e-mail.

Mxsmanic,

If they descend, yes. QED.


Put some research effort into what QED means. You haven't proven
anything.

--
Thomas Borchert (EDDH)