The Jumo 211 was an inverted V-12 aircraft engine, Junkers Motoren's primary aircraft engine of World War II. It was the direct competitor to the famous Daimler-Benz DB 601 and closely paralleled its development. While the Daimler-Benz engine was mostly used in fighters and destroyers, the Jumo engine was primarily used in bombers such as Junker's own Ju 88 and Ju 87. The term aircraft engine, for the purposes of this article, refers to aircraft reciprocating, or rotary, internal combustion engines as opposed to jet engines or turboprops. ... For the Prussian/German landowning classes, see junker. The name Junkers (IPA: /ˈjunkeɺs/) is well known in connection with aircraft, which were produced under this name for the Luftwaffe during World War II. In particular the Ju 87 Stuka and Ju 52 Tante Ju were common symbols of the Nazi... The term aircraft engine, for the purposes of this article, refers to aircraft reciprocating, or rotary, internal combustion engines as opposed to jet engines or turboprops. ... World War II was a truly global conflict with many facets: immense human suffering, fierce indoctrinations, and the use of new, extremely devastating weapons such as the atom bomb World War II, also known as the Second World War, was a mid-20th-century conflict that engulfed much of the... The Daimler-Benz DB 601 was a German aircraft engine built during World War II. It was a liquid-cooled inverted V12, and powered the Messerschmitt Bf 109, among others. ... A bomber is a military aircraft designed to attack ground targets, primarily by dropping bombs. ... The Junkers Ju 88 was a WW2 Luftwaffe twin-engine multi-role aircraft. ... Junkers Ju 87 Dive-Bombers The Junkers Ju 87 or Stuka was the most famous Sturzkampfflugzeug (German dive bomber) in World War II, instantly recognisable by its inverted gull wings and fixed undercarriage. ...

The Jumo 211 was developed by Dr. Neugebauer as scaled-up successor to the earlier Jumo 210. In 1934, even before the new Jumo 210 had completed its acceptance tests, the RLM sent out a request for a new 1,000 hp-class engine of about 500 kg 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 Jumo 210 was Junkers Motorens first production gasoline aircraft engine, produced just before the start of World War II. It produced about 650hp in common versions, and can be considered a counterpart of the Rolls-Royce Kestrel in many ways. ... Reichsluftfahrtministerium (Reich Aviation Ministry / German Air Ministry / German Aviation Administration) Note: If you are looking for the RLM-GL/C list, please go to List of RLM aircraft designations The Reich Air Ministry (Reichsluftfahrtministerium or RLM), was a German civil service organization in charge of development and production of aircraft... Daimler-Benz AG was founded on May 1, 1924 by the merger of Benz & Cie. ... The Daimler-Benz DB 600 was a German aircraft engine built during World War II. It was a liquid-cooled inverted V12, and powered the Messerschmitt Bf 110, Heinkel He 111 among others. ...

The resulting Jumo 211 was first prototyped at Jumo's Dessau plant in 1935 and started testing in April 1936. Limited production of the 1,100 hp Jumo 211A started in April 1937 at Dessau, with just over 1,000 completed before full production was started at Magdeburg in July. Three models were provided with varied settings for its two-speed supercharger, tuned for different low- vs. high-altitude performance. The first aircraft powered by the 211A arrived that November. A supercharger (also known as a blower, a positive displacement pump or a centrifugal pumper) is a gas compressor used to pump air into the cylinders of an internal combustion engine. ...

But by this time the 600 had finally arrived. Unlike the 211, the 600 was an all-new design that introduced a number of new features. Notably it used a pressurized water cooling system that allowed it to use much less water and run at higher power settings at higher altitudes. Combined with a more powerful supercharger, the 600 was able to outperform the 211 at medium and high altitudes, relegating the 211 to lower altitude roles. Although many designs had already used the 211, including fighters like the Bf 109 and Me 110, these quickly moved to the 600 (and later the DB 601). The 211 then became the major bomber engine of the war, in no small part due to Junkers also building most of the bombers then in use. (Bf 109 was the official Reichsluftfahrtministerium designation, though some late_war aircraft actually carried the Me 109 designation stamped onto their aircraft type plates. ... The Messerschmitt Bf110 (later Me110) was a twin-engine heavy fighter in the service of the Luftwaffe during World War II. History Based around the concept of the long-range Zerstörer or Destroyer Fighter the Bf110 enjoyed some success in the Polish and French campaigns. ... The Daimler-Benz DB 601 was a German aircraft engine built during World War II. It was a liquid-cooled inverted V12, and powered the Messerschmitt Bf 109, among others. ...

Development of the 211 continued with the Jumo 211B being released in 1938, with a slightly increased maximum RPM of 2,400 which boosted power to 1,200 hp. The 211C and 211D differed primarily in the propeller gear ratios and other features.

A major upgrade was started in 1940 in order to better compete with the 601, following in its footsteps with a pressurized cooling system. The resulting 211E proved to be able to run at much higher power settings without overheating, so it was quickly followed by the 211F which included a strengthened crankshaft and a more efficient "fully shrouded" supercharger. Running at 2,600 RPM the F and similar J engines delivered a much improved 1,350 hp. Further improvements to this basic line led to the 1,425 hp 211N and 1,475 hp 211P.

Total production of the 211 series amounted to 68,248 engines with a production peak of 1700 engines per month in the autumn of 1942.

External links

• Photos of two Jumo 211A engines raised from Lake Jonsvatnet, Trondheim, Norway, in 2004 (Adresseavisen)

Adresseavisen is a regional newspaper published in Trondheim, Norway daily, except Sundays. ...