The Junkers J 1, nicknamed the Blechesel, was an experimental monoplane aircraft developed by Junkers & Co.
It was the world’s first all-metal aircraft.
Manufactured early on 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 both throughout its structure as had been done previously, and in its outer skins.
It originated from the work of pioneering aeronautical designer Hugo Junkers.
The experimental aircraft never received an official “A” nor an “E-series” monoplane designation from IdFlieg and the then-designated Fliegertruppe, and was officially known only by its Junkers factory model number of J 1.