Arching wings ( usually exaggerated in renderings ) are an interesting point of difference between Aitbus and Boeing. The higher the wings flex, the less effic

Arching wings ( usually exaggerated in renderings ) are an interesting point of difference between Aitbus and Boeing. The higher the wings flex, the less efficient they become since the lift vectors aren't perpendicular. So, a more rigid wing is more efficient but also heavier. And you need some flex to ride turbulence, though active control surfaces can help. Boeing has moved back to very flexy wings like it started in the jet era with the B-47 but Airbus tends towards more rigid. A few years ago I took a trip in a DC-10 and those wings were like planks of aluminium, they didn't flex at all.