Yakovlev Yak-7
| Yakovlev Yak-7 | |
|---|---|
|
|
| Type: | Fighter plane |
| Design country: | |
| Manufacturer: | |
| First flight: |
July 23, 1940 |
| Commissioning: |
1941 |
| Production time: |
1941 to 1944 |
| Number of pieces: |
6,399 |
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The Jakowlew Jak-7 ( Russian Яковлев Як-7 ) was a Soviet fighter aircraft of the Second World War . Originally developed as a two-seat school version for the Jak-1 , it was used as a front fighter due to its good performance. A total of 6,399 units were built between 1941 and 1944.
development
The first flight of the prototype took place on July 23, 1940 under the designation I-26UTI (also: Ja-7 ). The sample immediately went into production as Jak-7UTI and was immediately delivered to the school relays .
After the German attack on the USSR, it was decided to convert this model to a single-seat fighter. The rear cabin was retained; it was simply covered with a sheet metal and thus served as storage space for materials. The cover was later replaced by a hinged hatch and an additional 100 liter fuel tank was installed in the rear cabin. At the end of 1941 the single-seat Jak-7A went into series production.
After the war, the Jak-7 flew briefly in the air forces of Poland and Hungary.
Versions
The Jak-7 was a tubular steel construction with a rectangular cross-section in a low- wing design. The wings had two main wooden spars and were planked with plywood. The normal tail was self-supporting. The two main wheels of the rear wheel landing gear were retracted into the wing roots.
| designation | features |
|---|---|
| I-26UTI | Prototype, was developed parallel to the I-26 , the prototype of the Jak-1. |
| Jak-7UTI | First two-seater production version, still equipped as a school fighter. (Starting power each 563 kW (766 PS)) |
| Jak-7A | First production version as a fighter aircraft equipped with a 772 kW (1050 hp) WK-105P engine and slightly more pointed wings. |
| Jak-7B | Second, single-seater variant, built in large numbers (around 5,000 pieces). The first copies appeared with the WK-105P engine, later aircraft received the more powerful WK-105PF from mid-1942. |
| Jak-7W | Last series to be released again as a normal two-seater trainer version. It could optionally be equipped with skis and was built from July 1941 in a number of around 1,500. |
| Jak-7D | Version equipped with metal bars and larger tanks. Not built in series. |
| Jak-7-M-82 | Prototype with a radial engine M-82 from 1941. |
| Jak-7T | Experimental execution for fighting tanks. Two pieces were built, each with a 37 mm cannon or a 45 mm cannon in the propeller hub. |
| Jak-7K Kuriersky | Prototype from 1944 with a more comfortable rear cabin for the transport of staff officers. |
| Jak-7PWRD | Test vehicle from 1945 with two additional ramjet engines under the wings. Similar experiments had already been carried out with the I-153 . |
Military users
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- Free French Air Force : Fighter Squadron " Normandie-Niemen "
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- People's Liberation Army : 2 Jak-7W
- Lotnictwo Wojska Polskiego (Soviet-controlled Polish Air Force )
-
Hungary : 1 Jak-7W
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Technical specifications
| Parameter | Data (Jak-7B) |
|---|---|
| constructor | Alexander Sergejewitsch Jakowlew |
| span | 10.00 m |
| length | 8.47 m |
| height | 3.64 m |
| Wing area | 17.15 m² |
| Empty mass | 2,480 kg |
| Takeoff mass | 3,010 kg |
| Engine | a 12-cylinder V-engine Klimow WK-105P |
| power | 785 kW (1,067 hp) |
| Top speed | 613 km / h at an altitude of 3,200 m |
| Summit height | 10,200 m |
| Rise time | at 5,000 m 5.8 min |
| Range | 830 km |
| crew | 1 |
| Armament | a 20 mm SchWAK cannon in the propeller hub |
See also
literature
- Aircraft that made history: Jakowlew Jak-1/3/7/9 . In: de Agostini (ed.): Aircraft. The new encyclopedia of aviation . No. 59 . Topic, Munich-Karlsfeld 1994, p. 1633-1643 .
- Wilfried Copenhagen : Soviet fighters . Transpress , Berlin 1985, p. 160/161 .
- Heinz A. F. Schmidt: Soviet planes . Transpress, Berlin 1971, p. 95 .
