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I've noticed that the wings on the A380 are very curved in comparison to the 747. I mean the 747 has a lot of wing flex but the A380 has less wing flex and the wings are flexed down in comparison to the 747. Here there are two photos that might help you understand what I'm writing. So why are the A380 wings like that and what are the benefits? Source a380 7478

Source

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    $\begingroup$ I don't know that comparing the 380 to the 747 would be good, either, because the design philosophy may vary, due to temporal and material design differences. $\endgroup$ – J Walters Jan 29 '16 at 17:41
  • $\begingroup$ Oh yes. The A380 has a little bit of wingflex but the 747-8 for example doesn't flex down the wings as much as the A380.mileagegenius.com/wordpress/wp-content/plugins/Archive2/cache/… $\endgroup$ – kepler22b Jan 29 '16 at 18:01
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    $\begingroup$ @JonathanWalters The differences in philosophy and materials is the point of the question. I think the original comparison was far more interesting than this. Yes the 787 and a380 have different philosophies, what's fun is knowing all the details as to why. $\endgroup$ – Jay Carr Jan 29 '16 at 19:16
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The wings are designed like that. You can see them in the picture below.

A380

Image from airliners.net

  • The A380 wings are designed to be the most efficient while still inside the 80m 'box' for efficient airport operations. The result is a clean slate design which used CFD extensively to get the most efficient aerodynamic design possible.

  • The 'curve' near the root means that the landing gear in the wings could be as short as possible while being long enough to prevent a tail strike during rotation and allowing the spar to pass below the floor.

  • The shape also allows enough ground clearance for the inboard engines. This assumes importance with the advent of engines with ever higher bypass ratios.

  • Of course, the use of modern composite materials means the the wing 'flexes' up to be more or less straight once the aircraft is airborne.

enter image description here
(wikimedia.org) In-flight 'flex'.

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The A380 has a gull-wing design. This has some economic benefits, the main one being shorter landing gear while giving enough ground clearance for the engines.

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Aeroalias answer already covers most points. Still it may be worth to add that its not a clear gull wing, but more toward a dihedral setup with an increased volume at the front root part. This is most obvious when looking at it from the back while flying.

There are not many pictures showing one flying and from behind but this (taken from Wikipedia) might give a hint:

enter image description here

Beside the already mentioned advantage of shorter and thus lighter landing gear and more room for engine mount (much like the Ju87 inverted gull wind gid provide),

a dihedral wing also increases lateral stability in flight.

Increased comfort was as well one of the ambitious design criteria for the A380. Who ever had the chance to board one did enjoy the results. So considering the many, often each other contradicting requirements for wing (and fuselage) design, this marks a sweet spot - at least when reaching a certain size :))

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  • $\begingroup$ That right-hand wing tip, and the presence of at least two people just under it, doesn't look too comforting... $\endgroup$ – a CVn Feb 18 at 15:33
  • $\begingroup$ Regarding pictures showing A380s in the air photographed from behind, Wikipedia seems to have a few. $\endgroup$ – a CVn Feb 18 at 15:34
  • $\begingroup$ @aCVn Great, thanks. $\endgroup$ – Raffzahn Feb 18 at 16:25

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