The Aircraft
The Ju-52 was actually known as the Ju-52/3m. The 3m stands for 3 engine (dreimotor). The original Ju-52 was the Ju-52 1m which was single engine (einmotor). When the prototypes were flown, it was discovered that the plane was underpowered, and two engines were added, one on each wing.
The Ju-52 had an interesting exterior. The outer skin was corrugated, giving the skin far greater strength than a flat sheet of metal. This allowed the plane to have fewer spars and braces, so it could be lighter, which increased the cargo carrying ability. Unfortunately, the wrinkled skin also added drag, but in the 1930s there was much less interest in high speed and more interest in ease of assembly and maintenance.
The Ju-52 was known as “Tante Ju” (Aunt Ju) and “Iron Annie”. The Ju-52 remained in production until the end of the war, and some continued in service until the late 1970s.