|Quoting Hypersonic (Thread starter):|
However, the tail-plane, esp on larger aircraft like the 777, MD-11 etc, DO produce draggy vortices to a lesser degree.
|Quoting 2H4 (Reply 2):|
The aircraft in the photo you reference is in landing configuration with flaps down. The flaps create a pitching moment that must be counteracted by the horizontal stabilizer. We can see vorticies in that photo because the horizontal stabilizer is creating lift of its own, compensating for the pitching moment created by the flaps.
|Quoting BoeingOnFinal (Reply 3):|
Many airliners with autoland capability (if not all?) trim nose up on final approach (don't remember the height, modes etc, probably differ from aircraft and manufacturer), which must be counteracted with elevator down. I believe this is to speed up the transition for a go-around in case of windshear or other situations where climb pitch is crucial.
|Quoting Mir (Reply 5):|
It's more because that's the angle of attack it takes to fly at the approach speed. If you fly slower, you have to pitch up more to maintain the same amount of lift.
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