General Information
Type Yak-7 M-105PA
Function Fighter
Year 1941
Crew 1
Powerplant
Type M-105PA
Takeoff Power 1100hp
Power at 0m 1020hp
Power at 2000m 1100hp
Size
Length 8.50m
Height ?m
Wingspan 10.0m
Wing area 17.15m2
Weights and loads
Empty 2477kg
Loaded 2960kg
Wing Load (kg/m2) 173
Power load (kg/hp) 2.69
Speed
at 0m 471km/h
at 4500m 560km/h
Landing 136km/h
Maneuverability
Turn time 24sec
Roll
Takeoff 375m
Landing 550m
Range
Practical 643km
Ceiling
Ceiling 9250m
Climb
5000m 6.8min
Payload
Fuel 305kg
Cargo ~100kg in rear cabin
Seats (1)
Armament
Gun Type 1*20mm ShVAK
Position through the hub
Ammo 120
Gun Type 2*7.62mm ShKAS
Position engine cowling
Ammo 2*750
Salvo 1.73 (kg/sec)
Rockets 6*RS-82

Yak-7 fighter by K.V.Sinelschikov

75k b/w Yak-7s on the assembly line, from "Soviet Combat Aircraft of the Second World War" by Yefim Gordon and Dmitri Khazanov, Vol.1 p.134
Courtesy of Thomas Heinz

Yak-7 with M-105PA engine and VISh-61P propeller was a conversion of the Yak-7UTI trainer into single-seat combat aircraft. Conversion was performed at Factory N°301 following initiative of the leading engineer K.V.Sinelschikov and team of the Yakovlev OKB members. This team was assigned to the factory to assist in mass production of the Yak-7UTI. They used series aircraft N°04-11 and introduced following changes:

Tailwheel and the canopy remained same as on Yak-7UTI, and except the RS-82 rails both aircraft had identical appearance. New fighter was more advanced than contemporary series Yak-1. It had following advantages:

Empty space of the second cockpit could be used in a number of ways, quite unusual for fighters:

Technical commission of the OKB rated Yak-7 fighter as a perspective design allowing numerous modifications. First reaction of A.S.Yakovlev was skeptical, but after detailed study he approved the conversion. He presented the the Yak-7 design to the top officials, and, in turn, gained support. In August 1941 production was ordered on two factories - N°153 (Novosibirsk) and N°301 (Moscow).

Production of the original Yak-7 was not really a big series one: 51 were assembled in Moscow (Factory N°301) in September-October, and eleven more at Factory N°153 in December 1941. Pause in November was caused by Factory N°301 evacuation and integration into plant N°153.

Yak-7 fighter N°04-11 was evaluated at NII VVS and received positive resume. Detailed studies of aircraft handling were carried out by factory N°153 test pilot A.N.Lazarev and TsAGI team. Yak-7 was considered superior against LaGG-3 and spin safe. Spin could be stopped immediately by placing stick and pedals into neutral position.

In September 1941 Yak-7 N°06-05 with RS-82 launchers installed was sent to the NIPAV (Scientific Trial Range of the Aircraft Armament). Better stability of the Yak-7 and decreased salvo proved its advantage over rocket-armed LaGG-3 and MiG-3:

Aircraft Yak-7 LaGG-3 MiG-3
Firing Altitude (m) 600 800 500
Aircraft speed (km/h) 400 400 400
Dive Angle (deg) 50...60 45...50 45...60
Salvo 2...4 4 4...6
Range scatter (m) 8...20 5...34 20...82
Transverse scatter (m) 6...18 9...29 15...39

Tests also revealed defects in landing gear, pneumatic system and insufficient assembly quality. Original Yak-7 fighter was replaced in production by improved Yak-7A.

PredecessorsModifications

Yak-7UTI

Yak-7A
References
  • "Yak fighters of the Great Patriotic War period" by A.T.Stepanets
  • "History of aircraft construction in the USSR" Vol.2 pp.196...199
  • "Russian Civil and Military aircraft 1884~1969" by Heinz J.Nowarra and G.R.Duval, pp.117...121
  • "Russian aircraft since 1940" by Jean Alexander, p.424-426;
  • 'Yak fighter in action' by Hans-Heiri Stapfer.
  • Links
  • See links at the Yak-7 Family Page

  • Created December 17, 2000 Back to
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