Junkers Jumo 210

The Junkers Jumo 210 was the company's first production inverted V12 gasoline aircraft engine, built from the early 1930s and delivering between 610 and 730 PS depending on version. It began in 1931 as the L10, which Germany's engineers regarded as the country's first truly modern engine design, with three valves per cylinder, an inverted-V layout, a standard supercharger and a cast cylinder block. The L10 first ran in static tests on 22 October 1932, and after the Air Ministry rationalised designations it became the 210. It first flew on 5 July 1934 in a Junkers W33. It was used in the Bf 109 and the early Ju 87, but it was soon relegated to the small end of the power scale and replaced by the larger Jumo 211.