Simviation Forum - Primary Flight Display........

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Primary Flight Display........ (Read 476 times)

Sep 26^th, 2011 at 11:16am

bgyuk Offline
Colonel
I love YaBB 1G - SP1!

Posts: 19

Does anyone know what the following reading on the PFD is for? I have looked all over, and i can't for the life on me work it out. The one circled in red, not the localisers.

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Reply #1 - Sep 26^th, 2011 at 2:50pm

Knick Offline
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Toronto, Ontario, Canada

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Posts: 334

Isn't that angle of attack? Undecided

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Reply #2 - Sep 26^th, 2011 at 3:28pm

pete Offline
Admin
'That would be a network
issue'
Cloud Cuckoo Land

Posts: 8500

This 1st obvious Q is 'how can you make it change?'

If I get a chance I'll take a look at this ..... (meanwhile someone else will probably have the answer)

Think Global. It's the world we live in.

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Reply #3 - Sep 26^th, 2011 at 4:50pm

pete Offline
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'That would be a network
issue'
Cloud Cuckoo Land

Posts: 8500

Kick is right. AoA.

More info

http://www.b737.org.uk/flightinsts.htm

Thanks for the question - learned something ... Cool

Think Global. It's the world we live in.

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Reply #4 - Sep 26^th, 2011 at 6:27pm

Dave71k Ex Member

I've wondered this myself for a while so thanks for finally finding the answer!!

However one thing I don't understand is how AOA relates to Pitch. In the example below my pitch was about 10 degrees but my AOA is 4.4.

How do these relate to each other?

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Reply #5 - Sep 26^th, 2011 at 6:51pm

Hagar Offline
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Quote:

However one thing I don't understand is how AOA relates to Pitch. In the example below my pitch was about 10 degrees but my AOA is 4.4.

How do these relate to each other?

This should explain it. http://www.smartcockpit.com/data/pdfs/flightops/aerodynamics/Understanding_The_A...

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Reply #6 - Sep 26^th, 2011 at 7:20pm

Dave71k Ex Member

Hagar wrote on Sep 26^th, 2011 at 6:51pm:

Quote:

However one thing I don't understand is how AOA relates to Pitch. In the example below my pitch was about 10 degrees but my AOA is 4.4.

How do these relate to each other?

This should explain it. http://www.smartcockpit.com/data/pdfs/flightops/aerodynamics/Understanding_The_A...

Thank you very much!

Basically AOA is the difference between your attitude (pitch) and you actual vector.

Just because your pitched up 10 degrees doesn't mean the aircraft is climbing at 10 degrees.

This clears up what confused me because now I see AOA is relative to airspeed. Hence why on the ground stationary AOA and Attitude are equal but at speed they are not.

Thanks! Cheesy

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Reply #7 - Sep 27^th, 2011 at 10:48am

EVVFCX Offline
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Been there done it-well
most of it.
Pontefract, West Yorkshire

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I only quickly scanned through the smartcockpit article, I didn't notice it mention changing air movement/airflow, only still air.

Presume most of of us have flown, either as pilot or passenger; ever notice the aircraft drop because the AoA has changed so far as to cause sudden loss of lift, either caused by sink or sudden updraft, the AoA has either gone negative or positive so far as to loose the flow of air close to the wing, set turbulence on and hopefully the gauge will change.
The article is good reading.

May the Mynd be with you.
So far my number of landings either passenger or pilot equal my number of takeoffs, but that is due to change

13/07/11 Passed BMFA Fixed Wing 'A' test.
FSX Gold

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Reply #8 - Sep 27^th, 2011 at 3:13pm

bgyuk Offline
Colonel
I love YaBB 1G - SP1!

Posts: 19

Thank you for the answers, I initially considered it could have been the AoA but then when i messed about with the pitch it didn't seem to make sense. However as pointed out there are many factors at work. Thanks for the links, i hate not having a full understanding of a plane/instruments Grin

. I will be reading both of them.

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