Drag-reducing winglets are so commonplace today that aircraft without them are often viewed as having old technology. But not all aircraft need winglets—or can accept them.  Winglets reduce lift-induced drag, but so does extending the wing span. Winglets work best where span is constrained, to fit a hangar or airport gate or because an existing wing is being modified.  But by generating forces at the tips, particularly when hit by a gust, winglets increase the bending ...


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