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UAL747
Topic Author
Posts: 6725
Joined: Mon Dec 13, 1999 5:42 am

Differences In Flare Angle

Sun Oct 25, 2009 8:18 pm

Can some explain to me why there are noticeable differences in the flare angle (sorry, do not know the correct term for this) for various aircraft?

My non-technical observations both in life and in pictures are that Airbus widebodies tend to flare at a greater angle than Boeing widebodies. MD and Lockheed widebodies seem to have the greatest flare of them all.

Now, these are my uneducated guesses for reasons why, even though I cannot back up anything.

1. Boeing aircraft have larger wing surface areas in comparison to their airbus counterparts, as well as larger flaps, therefore, they produce greater lift at lower speeds, reducing the angle of flare.

2. The greater wing sweep of the 747 and the MD jets in some way affect the angle.

3. The rear engined jets have the center of gravity placed further to the rear of the aircraft, shortening the length of the tail which allows for a higher angle. (Though, this wouldn't really be a reason as to why I don't think).

Can anyone explain?

Thanks,

UAL
"Bangkok Tower, United 890 Heavy. Bangkok Tower, United 890 Heavy.....Okay, fine, we'll just turn 190 and Visual Our Way
 
2H4
Posts: 7960
Joined: Tue Oct 19, 2004 11:11 pm

RE: Differences In Flare Angle

Sun Oct 25, 2009 8:23 pm

I think it has more to do with the presence and effectiveness of leading-edge devices.

2H4
Intentionally Left Blank
 
pilotpip
Posts: 2844
Joined: Fri Sep 19, 2003 3:26 pm

RE: Differences In Flare Angle

Sun Oct 25, 2009 8:27 pm

Weight, speed, wind conditions, wing designs and a number of other things. A lot of it is also optical illusion.
DMI
 
swiftski
Posts: 1837
Joined: Tue Dec 19, 2006 6:19 am

RE: Differences In Flare Angle

Mon Oct 26, 2009 12:21 am



Quoting UAL747 (Thread starter):
Can some explain to me why there are noticeable differences in the flare angle (sorry, do not know the correct term for this) for various aircraft?

My non-technical observations both in life and in pictures are that Airbus widebodies tend to flare at a greater angle than Boeing widebodies. MD and Lockheed widebodies seem to have the greatest flare of them all.

The flare is an art. There is a gradual increase in backpressure required to achieve the smoothest touchdown. You don't get to flare height, set a new attitude, and wait. There is more to it than that.
 
411A
Posts: 1788
Joined: Mon Nov 12, 2001 10:34 am

RE: Differences In Flare Angle

Mon Oct 26, 2009 2:39 am



Quoting 2H4 (Reply 1):
I think it has more to do with the presence and effectiveness of leading-edge devices.

Yes, correct...and, the installed angle of incidence of the wing.
Location of engines matters very little.

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