05/31/2009. Construction of the world's first flyable un-braced all-metal aircraft was started in September 1915 and Friedrich von Mallinkrodt took the J 1 to the air from the military airfield Döberitz on December 12. Power came from an 120 hp Mercedes D.II six-cylinder water-cooled in-line engine. The sole J 1, nicknamed "Blechesel" (tin plate donkey), was donated to the Deutschen Museum in Munich in 1926, however, it was destroyed in a bomb raid on Munich in 1944.
The J 1 should not to be confused with the first Junkers aircraft, the J 4, delivered to the German military under the Idflieg designation J.I)