Junkers J 1

The Junkers J 1, nicknamed the Blechesel, was an experimental monoplane aircraft developed by Junkers. It was the first all-metal aircraft in the world. Manufactured early in the First World War, an era in which aircraft designers relied largely on fabric-covered wooden structures braced with wires, the J 1 was a revolutionary development in aircraft design, making extensive use of metal in its structure and in its outer surface.