Junkers Jumo 012

The Junkers Jumo 109-012, known colloquially post-war as Jumo 012, was a turbojet engine under development in Germany during the Second World War. In essence, it was a scaled up version of the Jumo 004 which had already reached serial production by the end of the war. It was intended to power the EF 132 and variants of the Ju 287.

Development

After the Jumo 004 had entered serial production, the Technical Department of the RLM requested Junkers to build a much larger engine capable of powering the heavy jet bombers then under development for the Luftwaffe. Initially, Junkers proposed modifications of the Jumo 004, specifically the 109-004G and 109-004H. However, these variants were rejected as they were not powerful enough, and Junkers began to design the 109-012.^[1]

The engine was to feature an 11-stage axial compressor enclosed in a sheet-steel casing and a 2-stage, air-cooled turbine. It was proposed that an air-bleed system should be installed after the fifth compressor stage to supply compressed air, if needed.^[2] The RLM ordered ten pre-production examples of the 109-012 to be built at Dessau for testing, where several parts for the engines were already completed including nine exhaust cones.^[3] In December 1944, the RLM issued an order to Junkers calling for the firm to cease development on the 109-012, and further design work was moved to several other firms. By the end of the war, only one mock-up had been completed.^[4]

Specifications

Data from

General characteristics

• Type: Turbojet
• Length: 4.86m
• Diameter: 1.06m
• Dry weight: 2000kg

Components

• Compressor: 11-stage axial compressor
• Combustors: 8 can-type
• Turbine: 2 stages

Performance

• Maximum thrust: 27.3 kN (2780 kgf)
• Power-to-weight ratio:

See also

Comparable engines

• Heinkel HeS 011

Related lists

• List of aircraft engines

References

Notes

Sources

• Kay, Anthony. German Jet Engine and Gas Turbine Development 1930–1945. Airlife Publishing, 2002