According to "Austro-Hungarian Army Aircraft of World War One" (by Peter M. Grosz, George Haddow, and Peter Schiemer, Flying Machine Press, 1993. pages 370-372) here is the Zaparka Fighter, designed by Oberleutnant Eduard Zaparka. The book says there is a total lack of documentation of this Austrian aircraft. It was apparently built by Zaparka without the knowledge of his Army superiors. The wing design was patented in September 1917. It allowed the pilot to change the angle of incidence (manual variable incidence, or V-I) during flight, but the mechanism for this is not known. The sole prototype crashed and was not rebuilt.

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