of the wing. This ensures the wing root stalls first and contributes to docile stall behaviour and maintaining aileron control throughout the stall. Using slots in this manner produces a similar result to employing washout on a wing, but through a different means. Examples of aircraft with partial-span, fixed slots are the Stinson 108, Bristol Beaufort, Lockheed Hudson, and Dornier Do 28D-2 Skyservant. See also Alula, a bird's biological equivalent to the leading-edge slot Leading-edge droop flap High-lift device References Ira H. Abbott, and Albert E. Von Doenhoff (1959), Theory of Wing Sections, Dover Publications Inc., New York SBN 486-60586-8 Aviation Publishers Co Limited: From the Ground Up, Twenty-Seventh Revised Edition. Aviation Publishers Co Limited, 1996. Clancy, L.J. (1975), Aerodynamics, Chapter 6 High Lift Devices, Pitman Publishing Limited, London Kermode, A.C. (1972), Mechanics of Flight, Chapter 3 Aerofoils – Subsonic Speeds (8th edition) Pitman Publishing Limited, London External links History of patent and Handley Page "Developments in Aircraft Design by the use of Slotted Wings" an article by Frederick Handley Page published in a 1921 issue of Flight Aircraft wing design Handley Page