celestar
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Joined: Mon Jul 09, 2001 11:37 am

Airbus Vs Boeing: Landing AOA And Take Off

Wed Aug 01, 2012 2:05 am

Two questions to ask:
Why Airbus plane all exhibit a higher angle of attack while performing landing? If you look at an Airbus A330 or 340 vs Boeing 777 or Boeing 747, Airbus plane has a much more visible "nose up" while landing as oppose to Boeing plane. I have been observing this for a long time.
Is AIRBUS A330 wing more efficient or is it because it is lighter, that makes the take off run on A330 vs B777-200 much shorter to reach take off speed and lift off? Very curious to know the answer please.
 
vikkyvik
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RE: Airbus Vs Boeing: Landing AOA And Take Off

Wed Aug 01, 2012 3:33 am

Quoting celestar (Thread starter):
Why Airbus plane all exhibit a higher angle of attack while performing landing? If you look at an Airbus A330 or 340 vs Boeing 777 or Boeing 747, Airbus plane has a much more visible "nose up" while landing as oppose to Boeing plane. I have been observing this for a long time.

I've noticed the same thing for a long time, but it's important to distinguish between AoA and Deck Angle. What we're seeing is Deck Angle - the angle of the fuse relative to horizontal. Whereas AoA is the angle of the wing with respect to the airflow. It's not immediately apparent just from deck angle.

Quoting celestar (Thread starter):
Is AIRBUS A330 wing more efficient or is it because it is lighter, that makes the take off run on A330 vs B777-200 much shorter to reach take off speed and lift off? Very curious to know the answer please.

I don't know the answer, but there are MANY variables here:
1.) The airplanes have different weights (MTOW, empty, payload, fuel, etc.).
2.) The airplanes have different engines.
3.) Depending on which variants, they may have significantly different missions.
4.) The takeoffs you have observed may be going to different destinations = different loads.
5.) Wind conditions may be different.

...and so on.
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rcair1
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RE: Airbus Vs Boeing: Landing AOA And Take Off

Wed Aug 01, 2012 4:39 am

Quoting celestar (Thread starter):
Why Airbus plane all exhibit a higher angle of attack while performing landing? If you look at an Airbus A330 or 340 vs Boeing 777 or Boeing 747, Airbus plane has a much more visible "nose up" while landing as oppose to Boeing plane

It's because the Airbus is made in France.....   
rcair1
 
celestar
Topic Author
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RE: Airbus Vs Boeing: Landing AOA And Take Off

Wed Aug 01, 2012 7:11 am

Quoting vikkyvik (Reply 1):

Thanks for correcting my choice of words.
On the second question, the mentioned variables are all taken into account. I regularly flew from Taiwan to HK on CX. Experience from flying in A330 vs B777-200 is obvious in terms of the take off run. Obviously, I am not comparing with B777-300 which is a bigger payload plane.

On the first subject, it is always very graceful to see a Airbus plane landing, minus the A380. All Airbus planes, espeically the A330/340 (the A320 to a lesser extent but still obvious), hold up their nose and gracefully perform their landing in an almost 'stalling' manner!!
 
sccutler
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RE: Airbus Vs Boeing: Landing AOA And Take Off

Wed Aug 01, 2012 11:46 am

As noted above, AoA is not the same thing as deck angle.

All things being equal, you should not hope for too much nose-up to be required when landing, as that would make the pilots' view of the runway environment more restricted, thus affecting safety negatively. A steeper deck angle also makes tail strikes more likely on go-around.

The visually-satisfying "gracefulness" from the outside observer is an irrelevant abstraction to the pilots and to the aircraft's operation as a whole. Look, some time, at the relatively modest deck angle of the L1011, which seemed to do just fine...
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