Yakovlev Yak-5

The Yakovlev Yak-5 (Russian: Яковлев Як-5) was an experimental trainer aircraft designed by Yakovlev OKB in the Soviet Union, and first flown in 1944.

Yak-5
Role Training aircraft
Manufacturer Yakovlev
First flight 7 September 1944
Primary user Soviet Air Force
Number built 1
Developed from Yakovlev UT-2

Development and design

In 1944, the Yakovlev UT-2 was the standard primary trainer of the Soviet Air Forces, but its simplicity caused problems when pilots moved on to more sophisticated aircraft, so the Yakovlev design bureau designed a more sophisticated derivative, the UT-2L, which featured an enclosed tandem cockpit, the addition of flaps and blind flying instruments.[1][2]

At the same time, Yakovlev designed a single-seat aircraft based on the UT-2L, intended as a fighter-trainer. This aircraft, the Yak-5, was a low-wing monoplane of wooden construction, but unlike the UT-2, had the front cockpit removed and an enclosed sliding canopy placed over the rear cockpit. A retractable tailwheel undercarriage replaced the fixed landing gear of the UT-2. It was powered by a Shvetsov M-11D five-cylinder radial producing 115 hp (86 kW), which drove a two-bladed variable-pitch propeller. It could be fitted with a single synchronized ShKAS machine gun aimed by a reflector sight, while the aircraft was also fitted with a radio.[3][4]

Operational history

The prototype Yak-5 first flew on 7 September 1944.[5] The new fighter-trainer's handling proved popular with its test pilots, and the aircraft successfully passed official evaluation. In the end, neither the UT-2L or the Yak-5 entered production because the Soviet Air Force command believed wooden aircraft were becoming obsolete, which would result in production of the all-metal Yakovlev Yak-18 trainer in late 1945.[4][5] The sole Yak-5 was destroyed when it suffered failure of the wooden wing during a snap roll and crashed.[5][6]

Specifications (Yak-5)

Data from Yakovlev Aircraft since 1924[5]

General characteristics

  • Crew: 1
  • Length: 7.3 m (23 ft 11 in)
  • Wingspan: 10.5 m (34 ft 5 in)
  • Wing area: 17 m2 (180 sq ft)
  • Empty weight: 770 kg (1,698 lb)
  • Max takeoff weight: 940 kg (2,072 lb)
  • Powerplant: 1 × Shvetsov M-11D 5-cylinder air-cooled radial piston engine, 86 kW (115 hp)
  • Propellers: 2-bladed VISh-237 variable-pitch propeller

Performance

  • Maximum speed: 250 km/h (160 mph, 130 kn)
  • Landing speed: 85 km/h (53 mph; 46 kn)
  • Range: 450 km (280 mi, 240 nmi)
  • Take-off run: 180 m (590 ft)
  • Landing run: 200 m (660 ft)

Armament

Avionics

  • PBP-1 reflector sight

References
Notes
  1. Gunston 1995, p. 459.
  2. Gordon, Komissarov and Komissarov 2005, pp. 56–57.
  3. Gunston and Gordon 1997, p. 91.
  4. Gordon, Komissarov and Komissarov 2005, p. 57.
  5. Gunston and Gordon 1997, p. 92.
  6. Gunston 1995, p. 467.
Sources
  • Gordon, Yefim, Dmitry Komissarov and Sergey Komissarov. OKB Yakovlev: A History of the Design Bureau and its Aircraft. Hinkley, UK: Midland Publishing, 2005. ISBN 1-85780-203-9.
  • Gunston, Bill. The Osprey Encyclopedia of Russian Aircraft 1875–1995. London: Osprey, 1995. ISBN 1-85532-405-9.
  • Gunston, Bill and Yefim Gordon. Yakovlev Aircraft since 1924. London, UK: Putnam Aeronautical Books, 1997. ISBN 1-55750-978-6.
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