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The Jumo 211 was a German inverted V-12 aircraft engine, Junkers Motoren's primary aircraft engine of World War II. It was the direct competitor to the Daimler-Benz DB 601 and closely paralleled its development. While the Daimler-Benz engine was mostly used in single-engined and twin-engined fighters, the Jumo engine was primarily used in bombers such as Junkers' own Ju 87 and Ju 88, and Heinkel's H-series examples of the Heinkel He 111 medium bomber. It was the most-produced German aero engine of the war, with almost 70,000 examples completed.

Jumo 211
Jumo 211D engine, mounted inverted in this photo
Type Piston V-12 aero-engine
Manufacturer Junkers
First run 1936
Major applications Avia S-199
Heinkel He 111H
Junkers Ju 87B-G
Junkers Ju 88A/C
Number built 68,248
Developed into Jumo 213

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 1,000 PS (986 hp; 735 kW)-class engine of about 500 kg (1,100 lb) 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.[1] 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.[citation needed]

Three models were provided with varied settings for its two-speed supercharger, tuned for different low- versus high-altitude performance. The first prototype aircraft powered by the 211A appeared in late 1937.[citation needed] Development of the 211 continued with the 211B being released in 1938, with a slightly increased maximum RPM of 2,400 which boosted power to 1200 PS (1184 HP). The later 211C and 211D differed primarily in the propeller gear ratios and other features.

Junkers Jumo 211B/D engine at the Luftwaffenmuseum der Bundeswehr
Junkers Jumo 211B/D engine at the Luftwaffenmuseum der Bundeswehr

The competing DB 600 design was generally similar but lacked the direct injection system. When the RLM expressed their opinion that all future engines include this feature, Daimler responded by introducing the DB 601 in late 1937.

A major upgrade was started by Junkers in 1940 adapting the Jumo 211 with a pressurized cooling system. Under pressure, the boiling point of water increases, allowing the engine to run hotter. This, in turn, allows a given amount of cooling fluid to carry away more energy. As a result, the engine could run at higher power settings with a smaller radiator 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 supercharger. Running at 2,600 RPM the 211F delivered 1,340 PS (1,320 hp; 990 kW) and the 211J (a 211F with intercooler) 1,420 PS (1,400 hp; 1,040 kW). Further improvements to this basic line led to the 1,450 PS (1,430 hp; 1,070 kW) 211N and 1,500 PS (1,500 hp; 1,100 kW) 211P in 1943, they were equivalent to the 211F/J but with slight boost increases and running at up to 2,700 rpm. Continued development of the 211 line evolved into the Jumo 213.

The Me 264 V1 Amerika Bomber contract competitor fitted with four unitized Jumo 211 engines, each one matching the type fitted to Ju 88As
The Me 264 V1 Amerika Bomber contract competitor fitted with four unitized Jumo 211 engines, each one matching the type fitted to Ju 88As

The Jumo 211 became the major bomber engine of the war, in no small part due to Junkers also building a majority of the bombers then in use. Of course, since it was the Luftwaffe that selected the final engine to be used after competitive testing on prototypes (such as the Dornier Do 217), there is certainly more to it. Limited production capacity for each type, and the fact that the Jumo was perfectly capable (if not superior) in a bomber installation meant that it made sense to use both major types to the fullest; since the Daimler had a slight edge in a lightweight, single-engine application, that left the Jumo to fill in the remaining roles as a bomber engine. Even this wasn't enough in the end, and radial engines like the BMW 801 were increasingly put into service alongside the Jumo and DB series, most often in multi-engine installations like the Jumo.

Total production of the 211 series amounted to 68,248 engines, including 1,046 prototypes and development engines, with a production peak of 1700 engines per month in the autumn of 1942. From 1937 to mid-1944, production was spread between factories in Magdeburg, Köthen, Leipzig, Stettin and Strasburg.[2] It was the most-produced German aviation engine of the World War II years, and was quite likely to have been the first model of German aviation engine selected for "unitizing" as a Kraftei pre-packaged "engine module" – such Kraftei units for the Ju 88A were, as one example, used as to power the Messerschmitt Me 264 V1 competitor for the Amerika Bomber contract in December 1942.


Variants


Powers and rotational speeds are for take-off at sealevel.[2]

Engine modelPower in PSPower in hpPower in kWpower at rpm
A (early)1,0009867362,200
A (late)1,1001,0858092,300
B,C,D,H,G1,2001,1848832,400
F,L,M,R1,3401,3229862,600
J1,4201,4011,0442,600
N1,4501,4301,0672,700
P1,5001,4791,1032,700

Applications



Specifications (Jumo 211Ba / 211Da)


Jumo 211F
Jumo 211F

Data from Flugzeug-Typenbuch. Handbuch der deutschen Luftfahrt- und Zubehör-Industrie 1944[3]

General characteristics

Components

  • 211Ba: 7.82:1 high ratio drive
  • 211Da: 11.375:1 high ratio drive

Performance

  • 1,200 PS (1,183.6 hp; 882.6 kW) at 2,400 rpm (1 minute) at sea level
  • 1,020 PS (1,006.0 hp; 750.2 kW) at 2,400 rpm (5 minute) at sea level
  • 950 PS (937 hp; 699 kW) at 2,300 rpm (30 minute) at sea level
  • 800 PS (789 hp; 588 kW) at 2,100 rpm (max. continuous) at sea level
  • 660 PS (651 hp; 485 kW) at 2,300 rpm (cruise) at sea level
  • 1,025 PS (1,011 hp; 754 kW) at 2,200 rpm at 1,710 m (5,610 ft) supercharger low ratio[citation needed]
  • 975 PS (962 hp; 717 kW) at 2,200 rpm ( / ) at 4,200 m (13,780 ft) supercharger high ratio[citation needed]
  • 211Ba 0.595:1
  • 211Da 0.645:1



See also


Related development

Comparable engines

Related lists


References


  1. Christopher, p. 78
  2. Kay, pp. 271–272
  3. Schneider, Helmut (Dipl.Ing.) (1944). Flugzeug-Typenbuch. Handbuch der deutschen Luftfahrt- und Zubehör-Industrie 1944 (in German) (Facsimile reprint 1986 ed.). Leipzig: Herm. Beyer Verlag. p. 414. ISBN 381120484X.

Bibliography





На других языках


[de] Junkers Jumo 211

Der Junkers Jumo 211 war ein flüssigkeitsgekühlter Zwölfzylinder-Flugmotor mit Benzindirekteinspritzung der Junkers Flugzeug- und Motorenwerke. Mit einem Hubraum von 35 Litern hatte er eine Startleistung von bis zu 1500 PS.
- [en] Junkers Jumo 211

[es] Junkers Jumo 211

El Junkers Jumo 211 fue un motor aeronáutico en configuración V12 invertida. Fue el principal motor producido por el fabricante Junkers Flugzeug und Motorenwerke AG durante la Segunda Guerra Mundial, competidor directo del famoso Daimler-Benz DB 601 y desarrollado de forma casi paralela a este. Mientras el motor de Daimler-Benz fue en su mayoría utilizado en aviones de caza monomotor y bimotor, el motor Jumo fue principalmente instalado en bombarderos como los propios Ju 87 y Ju 88 .

[fr] Junkers Jumo 211

Mis à l'étude avant même l'acceptation du Junkers Jumo 210 par la Luftwaffe, le Junkers Jumo 211 se présentait comme une version agrandie de son prédécesseur avec une cylindrée de 35 litres. Il fut le concurrent direct du Daimler-Benz DB 601 qui eut un grand succès dans l'équipement des chasseurs allemands, le Jumo 211 eut tendance à se spécialiser comme moteur de bombardier, équipant entre autres, les Ju 87 et Ju 88, ainsi que le Heinkel He 111. Ce moteur fut une des plus belles réussite de Junkers avec 68 248 exemplaires produits.

[it] Junkers Jumo 211

Lo Junkers Jumo 211 era un motore aeronautico a 12 cilindri motore a V invertita sviluppato dall'azienda aeronautica tedesca Junkers Flugzeug und Motorenwerke AG (JFM) dalla metà degli anni trenta ed utilizzato come equipaggiamento di velivoli durante il periodo della seconda guerra mondiale.

[ru] Junkers Jumo 211

Юнкерс Юмо 211 (нем. Junkers Jumo 211) — немецкий поршневой авиационный двигатель времён Второй мировой войны. Представлял собой перевернутый V-образный 12-цилиндровый поршневой двигатель жидкостного охлаждения. Являлся прямым конкурентом знаменитого двигателя Daimler-Benz DB 601 и развивался параллельно с ним, но в отличие от первого, обычно устанавливаемого на истребителях, ставился на бомбардировщики, в основном собственной конструкции Junkers.



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