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 (the Jumo 004 had already reached serial production by 1944). It was intended to power the EF 132 and variants of the Ju 287.

Jumo 109-012
Type	Turbojet
Manufacturer	Junkers
Major applications	Junkers EF 132

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 a bleed air system should be installed after the fifth compressor stage to supply compressed air, if needed. The RLM ordered ten pre-production examples of the 109-012 to be built at Dessau for testing, where several parts for the engines including nine exhaust cones were already completed.^[1] 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.^[1]

Specifications

Data from ^{[citation needed]}

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/6135 lb)
• Thrust-to-weight ratio: 1.39

In popular culture

An episode of The Antiques Roadshow filmed at Powis Castle in summer 2022 featured a blueprint of the Junkers 0-12.

See also

Comparable engines

• Heinkel HeS 011

Related lists

• List of aircraft engines