Hugo Junkers built marine diesels as early as 1913, two years before he built his first aircraft. Through World War I he concentrated on aero oil engines.
After the war Junkers switched to the development of petrol engines and formed Junkers Motorenbau (Jumo) in 1923. Probably the most famous Jumo piston engines were the V-12 211 and its derivative, the 213.

In 1936 Junkers Motorenbau merged with Junkers Flugzeugwerke and began developing a gas turbine engine. By 1939 the engine division had a contract for development of an axial-flow turbojet. This contract resulted in the Jumo 004 that powered the Me 262.

In 1933 Jumo began the design of the 211 which was first flown in a Ju 87A. Almost all production versions had direct fuel injection.
By the end of World War II 68,000 had been built.

models

• 211F-2: 1,350 hp (1007 kW)

specifications

• 12-cylinder inverted-vee piston
• 35 litre displacement (2,136 cubic inches)

used by

• Heinkel He111
• Junkers Ju 87 Stuka