Coordinated turns and the little ball

Jose schrieb:

Rudder applied while rolling a T38 at certain lateral deflections
above 1 g can actually couple the airplane and then be followed
immediately by a departure from controlled flight.

What does "couple" mean in this context?

I guess he means precession. If you roll fast enogh, your aircraft acts
as a gyroscope. Now apply a force perpendicular to the roll axis, and
the result will be a precession motion which can be pretty impressive.

You've probably seen (live on an airshow or canned in a video)
gyroscopic maneuvres flown with propeller driven planes. There, the
propellor is the gyroscope. When your aircraft lacks a propellor, you
can still fly gyroscopic maneuvres. The trick is to roll fast enough and
transform the entire aircraft into a gyroscope. You don't need a high
performance jet for this, it works pretty well with an aerobatic glider
with a sufficient roll rate, too (Fox, Swift).

Very funny stuff, yet completely irrelevant to the average spam can
driver. And I doubt MSFS's aerodynamic model canhandle it.

Stefan

I guess he means precession. If you roll fast enogh, your aircraft
acts as a gyroscope. Now apply a force perpendicular to the roll axis,
and the result will be a precession motion which can be pretty
impressive.



ok, I knew it must have soemthing to do with a gyro....I couldnt reason it
out...but this makes sence. I hope your right...or else ill just have to
go back to being confused again.

"new_CFI" wrote in message
...


I guess he means precession. If you roll fast enogh, your aircraft
acts as a gyroscope. Now apply a force perpendicular to the roll axis,
and the result will be a precession motion which can be pretty
impressive.



ok, I knew it must have soemthing to do with a gyro....I couldnt reason it
out...but this makes sence. I hope your right...or else ill just have to
go back to being confused again.

That's a shame it makes sense, as its not correct, and understanding all
things related to flying are worth knowing as a flight instructor. There's
really no reason for any instructor to be "confused" when a little research
will enhance understanding.
If you are actually interested in inertia coupling, perhaps a little bit of
research might bring you up to speed on it. If not, please accept my sincere
apology for having mentioned it.
Dudley Henriques

Dudley Henriques wrote:
"new_CFI" wrote in message
...


I guess he means precession. If you roll fast enogh, your aircraft
acts as a gyroscope. Now apply a force perpendicular to the roll axis,
and the result will be a precession motion which can be pretty
impressive.



ok, I knew it must have soemthing to do with a gyro....I couldnt reason it
out...but this makes sence. I hope your right...or else ill just have to
go back to being confused again.

That's a shame it makes sense, as its not correct, and understanding all
things related to flying are worth knowing as a flight instructor. There's
really no reason for any instructor to be "confused" when a little research
will enhance understanding.
If you are actually interested in inertia coupling, perhaps a little bit of
research might bring you up to speed on it. If not, please accept my sincere
apology for having mentioned it.
Dudley Henriques

Googling "inertia coupling" I found this, which cleared things up a bit
(at least for me):

A few of the experimental aircraft encountered a new type of behavior
known as inertia coupling, a behavior that was not fully appreciated
until the F-100 and F-102 also encountered it. Inertia coupling
resulted from the tendency of the new generation of high-speed aircraft
to concentrate most of the weight in a long thin fuselage, a departure
from the distribution of subsonic fighters. The X-3 configuration is an
excellent illustration. Even though its high-speed performance was
disappointing, the X-3's unanticipated susceptibility to loss of
control from inertia coupling contributed to understanding the problem.
With much less weight in the wing and tail, the dynamic motion in a
maneuver could cause the inertia of the fuselage to overpower the
aerodynamic stabilizing forces of the wing and tail. In the worst cases
the pilot lost control and the resulting abnormal air loads caused
airframe structural failure. The early F-100A models are remembered as
a classic example of susceptibility to inertia coupling, although the
initial F-102A models also encountered the problem.

--Walt
Bozeman, Montana

"Walt" wrote in message
ups.com...

Dudley Henriques wrote:
"new_CFI" wrote in message
...


I guess he means precession. If you roll fast enogh, your aircraft
acts as a gyroscope. Now apply a force perpendicular to the roll axis,
and the result will be a precession motion which can be pretty
impressive.



ok, I knew it must have soemthing to do with a gyro....I couldnt reason
it
out...but this makes sence. I hope your right...or else ill just have
to
go back to being confused again.

That's a shame it makes sense, as its not correct, and understanding all
things related to flying are worth knowing as a flight instructor.
There's
really no reason for any instructor to be "confused" when a little
research
will enhance understanding.
If you are actually interested in inertia coupling, perhaps a little bit
of
research might bring you up to speed on it. If not, please accept my
sincere
apology for having mentioned it.
Dudley Henriques

Googling "inertia coupling" I found this, which cleared things up a bit
(at least for me):

A few of the experimental aircraft encountered a new type of behavior
known as inertia coupling, a behavior that was not fully appreciated
until the F-100 and F-102 also encountered it. Inertia coupling
resulted from the tendency of the new generation of high-speed aircraft
to concentrate most of the weight in a long thin fuselage, a departure
from the distribution of subsonic fighters. The X-3 configuration is an
excellent illustration. Even though its high-speed performance was
disappointing, the X-3's unanticipated susceptibility to loss of
control from inertia coupling contributed to understanding the problem.
With much less weight in the wing and tail, the dynamic motion in a
maneuver could cause the inertia of the fuselage to overpower the
aerodynamic stabilizing forces of the wing and tail. In the worst cases
the pilot lost control and the resulting abnormal air loads caused
airframe structural failure. The early F-100A models are remembered as
a classic example of susceptibility to inertia coupling, although the
initial F-102A models also encountered the problem.

--Walt
Bozeman, Montana

Sounds like a winner to me. Thank you for taking the time and interest.
Dudley Henriques

With much less weight in the wing and tail, the dynamic motion in a
maneuver could cause the inertia of the fuselage to overpower the
aerodynamic stabilizing forces of the wing and tail. In the worst cases
the pilot lost control and the resulting abnormal air loads caused
airframe structural failure.

Sounds like a winner to me. Thank you for taking the time and interest.
Dudley Henriques

I'm not quite sure what that means, as far as what motion the fuselage actually
takes.

Does the nose veer off of the line of flight, or does something else happen?
--
Jim in NC

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"Morgans" wrote in message
...
| With much less weight in the wing and tail, the dynamic
motion in a
| maneuver could cause the inertia of the fuselage to
overpower the
| aerodynamic stabilizing forces of the wing and tail. In
the worst cases
| the pilot lost control and the resulting abnormal air
loads caused
| airframe structural failure.
|
| Sounds like a winner to me. Thank you for taking the
time and interest.
| Dudley Henriques
|
| I'm not quite sure what that means, as far as what motion
the fuselage actually
| takes.
|
| Does the nose veer off of the line of flight, or does
something else happen?
| --
| Jim in NC
|