The Jumo 210 was a completely different development from the Jumo 204/209 development. This engine was not an Diesel engine as the above, but a classic petrol engine and therefore continued the Junkers L-Series developements. While the Diesel engines were convenient for continous long-range flights at constant power as it was required for Lufthansa's transatlantic flights, the classic petrol engine was more usefull for military demands with short flights and continous power changes. The complete design is total different from the Diesel engines, which had a vertical positioning of the cylinders. The Jumo 210 instead had 12 cylinders positioned in a hanging V-form.
Developement of the Jumo 210 started in 1931 under the conventional petrol engine designator L10 . The L10 was first used in static tests on October, 22nd 1932. In 1933 the designator was changed to Jumo 210. Type approval for this engine was achieved in March 1934 and on July 5th 1934 a Junkers W33 was used as a testbed for the first inflight tests. An initial production of the Jumo 210A was also started in 1934. The later Jumo 210B and C were equipped with a ground loader as well as with a loader pressure regulation. The B-series had an airscrew drive of 0,57 for faster fighter aircraft while the C-series had a drive of 0,62 for slower aircraft. The Jumo 210 D/E had the same drives. Additionally they had a two gear loader Jumo 210Da/Ea had higher T/O power.
The Jumo 210G was theworld's first engine with an automatic mixture control unit and a fuel injection system, developed by Dr. Lichte , instead of classical compression. Jumo 210Ga had another loader drive ratio. The airscrew drive was 0,57. It became the most built subtype of the Jumo 210 and was used on the Bf109/110 and the Ju87 .
Further developments were planned as Jumo 210F and H, but were not realized. In 1935 the Jumo 210H was used for the further developement of the Jumo 211. A Jumo210S is a special development of the DVL with special regulation mechanisms. Production of the Jumo 210 came to an end in about 1938.
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