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Soviet Yakovlev Yak-7 fighter

Design

The Yak-7 started out to be a trainer but was later used as a fighter due to shortages of fighters.1

Trainer

In late 1939 Yakovlev began design on a dual seat trainer version of the I-26.2

Prototype

In June 1940 the I-26 trainer first flew.2

Yak-7M-82

The Yak-7M-82 prototype flew in February 1942.2

Production

  • Yak-7: 6,3001, 6,3992
    • Yak-7B: over 5,0002
    • Production: 1941 - early 19432
  • Yak-7V: 1941 - ?2
  • Yak-7PVRD: 22

Variants

  • I-26 trainer: Prototype.2 Two seats.2
  • Yak-7: Powered by M-105P (1,100 HP) engine.2
  • Yak-7A: Powered by M-105P (1,100 HP) engine.2
  • Yak-7B: Powered by M-105PF engine.2 Canopy could be jetisoned.2 More ammunition carried.2 Undercarriage redesigned with a retractable tailwheel.2 Could carry bombs or rockets under the wings.2
  • Yak-7DI: Long range fighter.1 It was to become the Yak-9.1,2
  • Yak-7M-82: Experimental.2 Had Shvetsov M-82 radial (1,700 HP) engine.2
  • Yak-7PVRD: Had DM-4C ramjets mounted under the wings that increased speed to 440 mph / 708 kph.2
  • Yak-7R: Had a rocket engine in the tail.1
  • Yak-7UTI: Trainer.1
  • Yak-7V: Trainer.1,2 The undercarriage was fixed, had dual controls, no armament, no radio, and no self sealing fuel tanks.1 Powered by M-105P (1,100 HP) engine.2

Usage

The Yak-7s were used by France and the Soviet Union.2

The Yak-7Bs were primarily used for ground attack and as a low altitude fighter.2

After the Yak-9 was introduced the Yak-7s were put into secondary duties.2

Specifications

  Yakovlev Yak-71,2
Type Fighter1,2, fighter trainer2
Crew Fighter: 11,2
Fighter-trainer: 22
Engine (Type)  
Cylinders  
Cooling  
HP  
Propeller blades  
Fuel capacity  
Dimensions  
Span  
Length  
Height  
Wing area  
Weight  
Empty  
Loaded  
Performance  
Speed  
Climb  
Cruising speed  
Service ceiling  
Range  
Armament  
  Yakovlev Yak-7B2
Type Fighter2
Crew 12
Engine (Type) Klimov M-105PF2
Cylinders V-122
Cooling  
HP 1,2602
Propeller blades 32
Fuel capacity  
Dimensions  
Span 32' 9.75"2
10 m2
Length 27' 9.5"2
8.47 m2
Height 9' 0.25"2
2.75 m2
Wing area  
Weight  
Empty 5,467 lb2
2,480 kg2
Loaded 6,680 lb2
3,030 kg2
Performance  
Speed @ sea level 336 mph2
541 kph2
Speed @ 10,170' /
3,100 m
382 mph2
615 kph2
Climb to 16,405' /
5,000 m
5.7 minutes2
Cruising speed  
Service ceiling 33,465'2
10,200 m2
Range 510 miles2
820 km2
Armament  
Nose 1: 20 mm2
2: 12.7 mm MG2
Bomb 441 lb2
200 lb2
OR  
Rockets 6: 82 mm2

Sources:

  1. Aircraft of WWII, General Editor: Jim Winchester, 2004
  2. Aircraft of WWII, Stewart Wilson, 1998
20th Century American Military History Crucial Site