Hi There,
Thanks, Germanophile-1, for that erudite explanation of where these interesting plates come from - saved me the trouble of answering!
To answer Romani's other question, the Rumpler D.I was the end-product of a lengthy series of experimental single-seat fighter designs from Rumpler. It incorporated many unique technical innovations, and was placed into limited production shortly before the war ended. To quote Peter Grosz (instead of simply plagiarizing): "When the war ended the Rumpler D.I, of which 22 had been completed, still had not passed the military acceptance requirements, although testing began on 2 February 1918. There is little doubt that the basic design was inspired and resulted in outstanding performance...The Rumpler D.I was an exceedingly complex machine whose perfection required time for careful analysis, exhaustive design and testing...The Rumpler D.I was trapped in a never-ending cycle of modification and revision."
Thus, the Rumpler D.I never saw combat in WWI, though
Ernst Udet and
Robert Ritter von Greim did fly examples in post-war air shows in Bavaria. Peter Grosz did a marvelous "Mini Datafile" on the type which still may be available from Albatros Productions. The artist in
Unsere Luftstreitkräfte 1914-1918 used more than a little artistic license when he showed a Rumpler D.I downing a Spad.