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A leading edge slot is a fixed aerodynamic feature of the wing of some aircraft to reduce the stall speed and promote good low-speed handling qualities. A leading edge slot is a spanwise gap in each wing, allowing air to flow from below the wing to its upper surface. In this manner they allow flight at higher angles of attack and thus reduce the stall speed.〔Kermode, A.C., ''Mechanics of Flight'', Chapter 3〕 ==Purpose and development== At an angle of attack above about 15° many airfoils enter the stall. Modification of such an airfoil with a fixed leading edge slot can increase the stalling angle to between 22° and 25°.〔Clancy, L.J., ''Aerodynamics'', Section 6.9〕 Slots were first developed by Handley Page in 1919 and the first aircraft to fly with them was the experimental H.P.17, a modified Airco DH.9A. The first aircraft fitted with controllable slots was the Handley Page H.P.20. Licensing the design became one of Handley Page’s major sources of income in the 1920s.〔(Centennial of Flight ) Retrieved 2008-02-19〕 Similar, but retractable, leading edge devices are called slats.〔Aviation Publishers Co. Limited, ''From the Ground Up'', page 26 (27th revised edition) ISBN 0-9690054-9-0〕 When the slat opens, it creates a slot between the slat and the remainder of the wing; retracted, the drag is reduced. A fixed leading edge slot can increase the maximum lift coefficient of an airfoil section by 40%. In conjunction with a slat, the increase in maximum lift coefficient can be 50% or even 60%.〔〔Kermode, A.C., ''Mechanics of Flight'', Figure 3.36〕 Unlike trailing edge flaps, leading edge slots do not increase the lift coefficient at zero angle of attack since they do not alter the camber.〔Kermode, A.C., ''Mechanics of Flight'', Figure 3.37〕 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Leading edge slot」の詳細全文を読む スポンサード リンク
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