The Junkers J 1 was a pioneering German aircraft designed by Hugo Junkers in 1915. It is notable for being one of the first all-metal aircraft, featuring a unique cantilever wing design that eliminated the need for external bracing. The J 1 was powered by a Mercedes D.II engine and had a distinctive, streamlined appearance. This aircraft was primarily used for testing and experimentation rather than combat. Its innovative design laid the groundwork for future aircraft development, influencing the evolution of aviation technology in the years that followed. The J 1 remains an important milestone in aviation history.