OKB-1 EF 140

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The OKB -1 EF 140 a prototype aircraft was developed in the Soviet Union by German engineers who had been captured at the end of the Second World War. They belonged to the German company Junkers and the Nazis had built a jet prototype Junkers Ju 287 which served as a model. Significant changes were however made by the engineer Brunolf Baade .

The aircraft was designed by the OKB-1, which comprised engineers who had worked at Junkers in World War II. It was originally designed as bomber. Then as reconnaissance aircraft.

One EF 140 was built . It began flight tests on 30 September 1948, powered by two Mikulin AM-TKRD-01 turbojets. Pursuant to a Soviet government decree issued on May 24, 1949, it was designated '140-R' and fitted with wingtip-mounted fuel tanks and the Mikulin engines replaced by Klimov VK-1s. Test flights in this iteration began on October 20 at a specially built airfield near the GOZ-1 factory at Borki.

The final variant of EF 140 was the '140-B/R', which was a reconnaissance bomber, powered by the same engines but with increased weight and reduced performance. The '140-B/R was completed and partially completed ground tests when all work on '140-R' and '140-B/R' aircraft was terminated by the Council of Ministers' directive No. 2474-974 issued on 18 June 1950.

Specifications

General characteristics

• Crew: Three
• Length: 19.70 m (63 ft)
• Wingspan: 19.40 m (62 ft 1 in)
• Height: 5.70 m (18 ft 3 in)
• Wing area: 58.4 m² (627 ft²)
• Empty weight: 12,500 kg (27,500 lb)
• Loaded weight: 24,500 kg (53,900 lb)
• Max takeoff weight: 27,000 kg (59,400 lb)
• Powerplant: 2× Mikulin AM-01 turbojets, 68.7 kN (15,400 lbf) each

Performance

• Maximum speed: 1,230 km/h (665 knots, 767 mph)
• Range: 2,500 km (1,350 nm, 1,558 miles)
• Service ceiling: 12,300 m (40,000 ft)

Armament

• 4 × 23 mm machine guns in two remotely-controlled turrets
• Production version was to carry 4,500 kg (9,900 lb) of bombs