Finally I have understood the supercritical wings of the Boeing 747-8 Intercontinental and of the Boeing 787 Dreamliner... The modern wings are not only curved horizontally (like conventional wings are curved more or less) but vertically as well (up-swept wing design)... These curvatures make the wings stronger - that's why they can be razor-sharp...
Best wishes, Joseph de la Mikula and Team
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