Importance

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Abstract

A leading edge flap system for an airplane includes a flap which is rotated about a single hinge point between (i) a retracted position, (ii) an intermediate extended position for high speed maneuvering, and (iii) a fully extended position for low speed maneuvering. In the high speed intermediate position, there is no slot between the flap and the wing leading edge. This position provides additional lift to improve the airplane's turning performance. On the other hand, in the low speed fully extended position, the flap is rotated a greater amount than in the intermediate extended position. In this position there is a slot between the flap and the fixed leading edge to permit air to flow from the bottom of the flap upward and over the upper surface of the leading edge. This improves the lateral stability of the airplane when in a sideslip during stall conditions.

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First Claim