This object is not on display at the National Air and Space Museum. It is either on loan or in storage.
Collection Item Summary:
Dr. Hugo Junkers started development of his Diesel aircraft engines in a small factory at Dessau, Germany in 1911. His early engines functioned on the two-stroke cycle principle with piston-controlled parts, as did his later Junkers Jumo Diesels. Among the advantages of later, refined Diesel aircraft engines were lower specific fuel consumption (for long-range applications), lower exhaust gas temperature (for exhaust-driven supercharger installations), and reduced fire hazard as compared to conventional reciprocating aircraft engines.
The Jumo 207 was a Jumo 205 with a turbo-supercharger. A Diesel operating on a two-stroke cycle, it incorporated six cylinders and 12 opposed pistons (i.e. 2 per cylinder) in an in-line, liquid-cooled configuration. The Jumo 207 could maintain its sea-level rated power to approximately 7,900 m (26,000 ft.). The Jumo 207 A and B powered the Junkers Ju 86 P and R reconnaissance/bomber aircraft that had an absolute ceiling of approximately 15,000 m (49,000 ft.).
Collection Item Long Description:
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- Type: Reciprocating, in-line, 6 cylinders with 12 pistons, two cycle, liquid-cooled, Diesel, supercharger
- Power rating: 746 kW (1,000 hp) at 3,000 rpm
- Displacement: 16.6 L (1,526 cu in.)
- Bore and Stroke: 105 mm (4.1 in.) x 2 x 160 mm (6.3 in.)
- Weight: 648.6 kg (1,430 lb)