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In general terms, in aircraft design dihedral, or a wing angled slightly upwards, contributes to the stability of the aircraft. Wing design has evolved immensely and with almost every new aircraft, new things appear. -Point of example is the upright wing extension many new airliners 'wear' - they figured out that a small amount of air 'slipping off' the wingtip added to fuel consumption. --Look at many fighter aircraft and see absolutely level or even anhedral wings (angled down) - this is because you don't want a fighter to be stable - a fighter pilot would prefer to flip over on his back in a millisecond - and many can ! - I remember the old F-4 Phantom with it's anhedral tail surfaces as being able to do a 'barrel roll' in the time you could blink !

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Q: Why do aircraft designers use dihedral angle?
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