Hugo Junkers was already engaged in the field of engine designs during his educational period at the University of Aachen before WW I.
In 1902 he established the Versuchsanstalt fur Olmotoren at Aachen.
Junkers' main approach was heading for the development of an oil engine and in June 1913 he founded the
Junkers Motorenwerke at Magdeburg, where he wanted to realize the theoretical approaches of his
Aachen period. Due to the development of WW I this facility was closed in 1915 and Junkers concentrated more in the field of aircraft design.
After the end of WW I Junkers returned to the engine development and in 1919 the second approach was made for the establishment of
an engine facility with the foundation of Junkers Motorenwerke AG (Jumo) at Dessau.
Jumo was responsible for the design and production of the L2 to L5 engines, which were used in the F13s and G24s,
as well as the larger oil engines L55 and L88, which were used for G38. Later the famous Jumo engines followed.
Since 1939 the responsibility for the engine design was transfered to the Otto-Mader Werke,
while the Junkers Flugzeug- und Motorenwerke were responsible for the serial engine productioon.
The following text concentrates on that part of Hugo Junkers' work and the developments of Junkers Motorenwerke until the end of WW II.