OKB-1 EF 140
| OKB-1 EF 140 | |
|---|---|
|
|
| Type: | Experimental bomber |
| Design country: | |
| Manufacturer: |
OKB-1 |
| First flight: |
September 30, 1948 |
| Number of pieces: |
1 |
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The OKB-1 EF 140 was a Soviet experimental aircraft with negative wing sweep from 1948.
development
The EF 140 was based on the German Junkers Ju 287 jet bomber from 1944, the specialty of which was the negative wing sweep. This should reduce the "leverage" of the shock waves running backwards on the swept wing . With a positive arrow the shock waves run outwards, with a negative one inwards, towards the fuselage. Therefore, the leverage is almost canceled.
The development was carried out by German engineers from the Junkers factories in Podberesje , who were brought to the Soviet Union in 1946 and were headed by Brunolf Baade . The aircraft was similar to the Ju 287, but was a redesign. It was the successor to the EF 131 .
Only one EF 140 was built, powered by two Mikulin AM TKRD-01 engines. Paul Jülge made the first flight on September 30, 1948 in Tjoply Stan .
The EF 140 was initially designed as a bomber , but was converted into a reconnaissance aircraft during testing . This is how the EF 140R variant with a larger wingspan and Klimow WK-1 engines was created. The first flight of the EF 140R took place on October 12, 1949. Development was discontinued after the fourth flight due to strong, irreversible vibrations of the wing.
In 1950, the development of the next prototype, the EF 140 B / R, was stopped without its maiden flight.
Technical specifications
| Parameter | OKB-1 EF 140 | OKB-1 EF 140R |
|---|---|---|
| crew | 4th | |
| length | 19.50 m | |
| span | 19.40 m | 21.90 m |
| Wing area | 58 m² | 61 m² |
| height | 5.70 m | |
| drive | 2 × Mikulin-AM-TKRD-01 jet engine | 2 × Klimow WK-1 jet engine |
| thrust | 3,300 kg each | 2,700 kg each |
| Top speed | 904 km / h | 837 km / h |
| Range | 2,000 km | 3,600 km |
| Service ceiling | 11,700 m | 14,100 m |
| Empty mass | 12,500 kg | k. A. |
| Takeoff mass | 23,000 kg | 25,540 kg |
| Defensive armament | 4 × 20mm cannons | 4 × 23mm cannons |
literature
- Dimitri Alexejewitsch Sobolew: German traces in Soviet aviation history. The participation of German companies and professionals in aviation development in the USSR . Mittler, Hamburg 2000, ISBN 3-8132-0675-0 .
