if gravity opens pendulous vanes....

[bLizZuE]

how the hell does that work in a coordinated turn?

How does load factor affect the operation of the pendulous vanes?

[tgrayson]

Originally Posted by bLizZuE

how the hell does that work in a coordinated turn?

How does load factor affect the operation of the pendulous vanes?

The attitude indicator will eventually erect with respect to the artificial gravity, hence one of the errors of the instrument. However, it maxes at 180 degrees. A 360 degree turn will undo the error.

[bLizZuE]

SO load factor will be affecting the pendulous vanes in a turn, and not true gravity? Any good reading on the subject?

[tgrayson]

Originally Posted by bLizZuE

SO load factor will be affecting the pendulous vanes in a turn, and not true gravity? Any good reading on the subject?

Einstein's General Theory of Relativity, regarding the equivalence of gravity and acceleration?

[bLizZuE]

I'll get right on that.

[jrh]

You have to think in three dimensional terms of the aircraft rotating around the gyroscope.

As was pointed out, the instrument's max error occurs at the 180 degree mark of a turn. That's because for the first 180 degrees of a circle, the instrument is recalibrating itself based on the G forces. It is being turned on its side.

However, remember how the gyro is "stuck in space" and the fuselage is pivoting around it? Well, just as there was a force for the first half of the 360, pushing the gyro to the side, during the second half of the 360 the same force will be pushing the gyro back towards its original position.

Does that help at all? Clear as mud?

[meritflyer]

Originally Posted by bLizZuE

I'll get right on that.

LMAO. You'll get that alot with tgrayson.

[tgrayson]

Originally Posted by bLizZuE

I'll get right on that.

Actually, not a joke. An aircraft in a steady turn has an acceleration towards the center of the circle. The contents of the aircraft resist being accelerated and this resistance feels just like gravity. Einstein said there is no experiment that can be performed that can tell the difference. You will run into pilots who, in all seriousness, claim that if they lost their gyro instruments, they'd hang something from the ceiling and try to keep it straight.

As for the attitude indicator errors, the Jepp book talks about them, but I don't recall how much detail.

[flyguy]

Originally Posted by tgrayson

Einstein's General Theory of Relativity, regarding the equivalence of gravity and acceleration?

Yup, and see if you can figure out how to build a gyro powered time machine while you're at it.

[seagull]

Originally Posted by tgrayson

Actually, not a joke.

I thought it was a great, obvious answer, and exactly correct. I am scratching my head to figure out how you could answer that question in a different way?

[psalm91]

http://www.faatest.com/books/IFRH/4-4.htm