Purpose
Aircraft designs include compromises intended to maximize performance for a particular role. One of the most fundamental of these is the size of the wing; a larger wing will provide more lift and reduce takeoff and landing distance, but will increase drag during cruising flight and thereby lead to lower than optimum fuel economy. High-lift devices are used to smooth out the differences between the two goals, allowing the use of an efficient cruising wing, and adding lift for takeoff and landing.
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