Deicer
Русский: Схема работы цикложира Svenska: Principen för cyclogiron.
A section of the wing of a Lockheed F-104 Starfighter, when flaps (left) and slats (right) are deployed. In high-speed flight, both are retracted, leaving a very flat profile.
Figure-1 from U.S. Patent Re19,412, "Aircraft and Control Thereof," dated January 1, 1935, E.F. Zaparka, inventor. This patent describes, and this image shows, a movable "microflap" similar to the fixed Gurney More
Flying_machine Public domain photograph - aircraft, aviation, free to use, no copyright restrictions image - Picryl description
Deutsch: Tragfläche der Vampyr mit Torsionsnase