Форум Breguet's Aircraft Challenge

Pfalz AIRCRAFT of World War I by Jack Herris

"The existance of the Pfalz D. IX, D. X, and D. XI is not proven. The D. IX was probably not built. The D. X was described as powered by the 160 hp Seimens-Halske Sh. III counter-rotary engine, and is probably the parasol monoplane fighter whose nose is just visable in an official film shot in 1918. Little is known of this type which did not go into production. The D. XI may have been a single bay prototype, whose twin-bay contemporary evolved into the production Pfalz D. XII, similar to the relationship of the D. Vii to the D. VII."