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 developed by the company Space Corporation Energia (OKB). It was originally designed as bomber. Then as reconnaissance aircraft.
One EF 140 was built . He began flight tests on 15 March 1949 with reactors Rolls-Royce Nene, because Mikulin reactors originally planned were not yet developed.
The project was abandoned before the completion of the second prototype due to advances made by traditional jet aircraft at the time.
- 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
- 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)
- 4 × 23 mm machine guns in two remotely-controlled turrets
- Production version was to carry 4,500 kg (9,900 lb) of bombs
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