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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.

Trainer

In late 1939 Yakovlev began design on a dual seat trainer version of the I-26.

Prototype

In June 1940 the I-26 trainer first flew.

Yak-7M-82

The Yak-7M-82 prototype flew in February 1942.

Production

  • Yak-7: 6,300, 6,399
    • Yak-7B: over 5,000
    • Production: 1941 - early 1943
  • Yak-7V: 1941 - ?
  • Yak-7PVRD: 2

Variants

  • I-26 trainer: Prototype. Two seats.
  • Yak-7: Powered by M-105P (1,100 HP) engine.
  • Yak-7A: Powered by M-105P (1,100 HP) engine.
  • Yak-7B: Powered by M-105PF engine. Canopy could be jetisoned. More ammunition carried. Undercarriage redesigned with a retractable tailwheel. Could carry bombs or rockets under the wings.
  • Yak-7DI: Long range fighter. It was to become the Yak-9.
  • Yak-7M-82: Experimental. Had Shvetsov M-82 radial (1,700 HP) engine.
  • Yak-7PVRD: Had DM-4C ramjets mounted under the wings that increased speed to 440 mph / 708 kph.
  • Yak-7R: Had a rocket engine in the tail.
  • Yak-7UTI: Trainer.
  • Yak-7V: Trainer. The undercarriage was fixed, had dual controls, no armament, no radio, and no self sealing fuel tanks. Powered by M-105P (1,100 HP) engine.

Usage

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

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

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

Specifications

  Yakovlev Yak-7
Type Fighter, fighter trainer
Crew Fighter: 1
Fighter-trainer: 2
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-7B
Type Fighter
Crew 1
Engine (Type) Klimov M-105PF
Cylinders V-12
Cooling  
HP 1,260
Propeller blades 3
Fuel capacity  
Dimensions  
Span 32' 9.75"
10 m
Length 27' 9.5"
8.47 m
Height 9' 0.25"
2.75 m
Wing area  
Weight  
Empty 5,467 lb
2,480 kg
Loaded 6,680 lb
3,030 kg
Performance  
Speed @ sea level 336 mph
541 kph
Speed @ 10,170' /
3,100 m
382 mph
615 kph
Climb to 16,405' /
5,000 m
5.7 minutes
Cruising speed  
Service ceiling 33,465'
10,200 m
Range 510 miles
820 km
Armament  
Nose 1: 20 mm
2: 12.7 mm MG
Bomb 441 lb
200 lb
OR  
Rockets 6: 82 mm

Sources:

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