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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.).

 Display Status

This object is not on display at the National Air and Space Museum. It is either on loan or in storage.
Object Details
Date Circa World War II Country of Origin Germany Type PROPULSION-Reciprocating & Rotary Manufacturer Junkers Flugzeug und Motorenwerke A.G.
 Physical Description 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) Dimensions Height 132.6 cm (52.2 in.), Width 59.9 cm (23.6 in.), Depth 218.4 cm (86 in.)
 Materials Magnesium, Paint, Steel, Aluminum, Nickel plating
 Inventory Number A19660013000 Credit Line Transferred from the U.S. Navy, Naval Supply Center, Cheatham Annnex, Williamsburg, Virginia. Data Source National Air and Space Museum Restrictions & Rights Open Access (CCO)
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