Junkers Ju 52

The Junkers Ju 52, best known in its Ju 52/3m form (nicknamed Tante Ju ("Aunt Junkers") and Iron Annie) is a transport aircraft that was designed and manufactured by German aviation company Junkers. First introduced in 1930 as a civilian airliner, it was adapted into a military transport aircraft by Nazi Germany.

Development of the Ju 52 commenced in the late 1920s, headed by German aeronautical engineer Ernst Zindel. The aircraft's design incorporated a corrugated duralumin metal skin as a strengthening measure, which was a material design pioneered by Junkers and used on many of their aircraft, including the popular Junkers F 13 1920s, the record-setting Junkers W 33, and Junkers W34. The corrugation was both a strength and a weakness; it provided increased structural strength but also increased aerodynamic drag. But more importantly it allowed the practical use of aluminum before newer alloys were developed.