Description1935 Zaparka airfoil control microflap patent.png
English: 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 flap independently discovered and first used by Dan Gurney in 1971.
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2007-07-07 01:24 Dhaluza 1547×777× (39645 bytes) Figure-1 from {{US patent|Re19412}}, "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 flap]] independently discovered and first
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