Engineering:Yakovlev Yak-5

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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

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.

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

  • 1x 7.62 mm (0.300 in) ShKAS machine-gun with 300 rounds

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. ↑ 4.0 4.1 Gordon, Komissarov and Komissarov 2005, p. 57.
  5. ↑ 5.0 5.1 5.2 5.3 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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