Qantas744er
Posts: 1162
Joined: Sat Jun 04, 2005 4:36 am

Airlines And Different Flap Settings?

Sat Dec 17, 2005 2:52 am

Hey, i have a question regarding Flap settings on the 747-400: The available Flap settings on a 747-400 are 10 and 20, for example Qantas only uses 20.
What is the reason for this? Does United Airlines only use 10? becuase on takeoffs the 744 always seem to have that setting on UA?

Cheers Leo
You live and you die, by the FMA
 
Grbld
Posts: 349
Joined: Tue Dec 06, 2005 9:25 pm

RE: Airlines And Different Flap Settings?

Sat Dec 17, 2005 3:28 am

This is mostly due to the operating philosophy of the airline and in individual instances due to performance issues at an airport. If the flaps are extended more, you will be able to rotate and lift off at a lower airspeed, thus using less runway (which may sometimes be required) and also have less wear and tear on the landing gear. However, this higher flap setting (farther extended) also means that your climb performance is worse than with a lower flap setting (less extended). So in some cases where runway length isn't an issue, but there may be obstacles in the climbout path, a lower flap setting may be desired.

Other than that, it does depend on airline philosophy.

Grbld.

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