text: Design and development The Jumo 211 was developed by Dr. Franz Josef Neugebauer as scaled-up successor to the earlier Jumo 210. The 210 was Germany's first modern aviation engine, with three valves per cylinder, a cast crankcase, and supercharger as standard. When it was designed in the early 1930s, its 700 PS design power was a relatively common power rating and many pre-war German designs were based around it. As it was further developed, the 210G introduced a piston-driven direct fuel injection, allowing it to reach its full potential.
  The 1930s saw rapid improvement in aircraft performance and great increases in size. In 1934, even before the new Jumo 210 had completed its acceptance tests, the RLM sent out a request for a new -class engine of about  weight. Both Jumo and Daimler-Benz responded, and in order to reach service before the new Daimler-Benz DB 600, the Jumo team decided to make their new design as similar as possible to their 210H model, currently in testing.
  The resulting Jumo 211 was first prototyped at Jumo's Dessau plant in 1935 and started testing in April 1936. Like the 210H, it featured a mechanical direct fuel injection system using small pistons driven off the crankshaft, three valves per cylinder, and an inverted V layout. It also had an open-cycle cooling system, working at atmospheric pressure. Limited production of the 1,000 PS Jumo 211A started in April 1937 at Dessau, with just over 1,000 completed before full production was started at Magdeburg in July.