Yakovlev Yak-11

The Yakovlev Yak-11 (NATO reporting name: "Moose", Russian: Як-11) is a trainer aircraft used by the Soviet Air Force and other Soviet-influenced air forces from 1947 until 1962. It was produced in 1946-1950 in USSR and in 1949-1953 in Czechoslovakia. A total of 4,566 were built (including 200 in Czechoslovakia), and about 120 still flying today.

Yakovlev Yak-11
Class Aircraft
Type Trainer
Manufacturer Yakovlev
Origin Russia (USSR)
Country Name Origin Year
Russia (USSR) 1945
Country Name Operational Year Retirement Year
Afghanistan View
Albania View
Algeria View
Angola View
Austria View
Bulgaria View
China View
Czechoslovakia View
Egypt View
Germany View
Hungary View
Iraq View
Mongolia View
North Korea View
Poland View
Romania View
Russia (USSR) 1946 1962 View
Somalia View
Syria View
Vietnam View
Yemen View
ManufacturerName Production From Production To Quantity
Yakovlev 4566 View
The Yakovlev design bureau began work on an advanced trainer based on the successful Yak-3 fighter in mid 1944, although the trainer was of low priority owing to the ongoing Second World War. The first prototype of the new trainer, designated Yak-UTI or Yak-3UTI flew in late 1945. It was based on the radial-powered Yak-3U, but with the new Shvetsov ASh-21 seven-cylinder radial replacing the ASh-82 of the Yak-3U. It used the same all-metal wings as the Yak-3U, with a fuselage of mixed metal and wood construction. Pilot and observer sat in tandem under a long canopy with separate sliding hoods. A single synchronised UBS 12.7 mm machine gun and wing racks for two 100 kg (220 lb) bombs comprised the aircraft's armament.

An improved prototype flew in 1946, with revised cockpits and a modified engine installation with the engine mounted on shock absorbing mounts. This aircraft successfully passed state testing in October 1946, with production beginning at factories in Saratov and Leningrad in 1947.

Production Yak-11s were heavier than the prototypes, with later batches fitted with non-retractable tail wheels and revised propellers. A 7.62 mm ShKAS machine gun was sometimes fitted instead of the UBS, while some were fitted with rear-view periscopes above the windscreen. In total, Soviet production amounted to 3,859 aircraft between 1947 and 1955. with a further 707 licence-built by Let in Czechoslovakia as the C-11.

The Yak-11 set five world-class records.

Yak-11U

In 1951, Yakovlev revised the design of the Yak-11, adding a retractable tricycle landing gear, with two variants proposed, the Yak-11U basic trainer and Yak-11T proficiency trainer, which carried similar equipment to contemporary jet fighters. The new aircraft had reduced fuel capacity and was unsuitable for operations on rough or snow-covered runways, and so was rejected for Soviet service, although a few examples were built in Czechoslovakia as the C-11U.

The Yak-11 entered service in 1947, serving as a standard advanced trainer with the Soviet Air Forces and DOSAAF. Both Yak-11 and C-11 were used in all Warsaw Pact countries and were exported to eighteen countries, including many African, Middle Eastern and Asian countries.

North Korean Yak-11s were used in combat in the Korean War, with one Yak-11 being the first North Korean aircraft shot down by US forces when it was shot down by a North American F-82 Twin Mustang over Kimpo Airfield on 27 June 1950. East Germany used the Yak-11 to intercept American reconnaissance balloons.

Role Training aircraft
Manufacturer Yakovlev, Let
First flight 10 November 1945
Introduction 1946
Retired 1962
Primary user Soviet Air Force
Number built 4566

General characteristics

  • Crew: Two - student and instructor
  • Length: 8.50 m (27 ft 10 in)
  • Wingspan: 9.4 m (30 ft 10 in)
  • Height: 3.28 m (10 ft 5 in)
  • Wing area: 15.40 m (166 ft)
  • Empty weight: 1,900 kg (4,189 lb)
  • Loaded weight: kg (lb)
  • Max takeoff weight: 2,440 kg (5,379 lb)
  • Powerplant: 1 x Shvetsov ASh-21 air-cooled radial piston engine, 425 kW (570 hp)

Performance

  • Maximum speed: 460 km/h (289 mph)
  • Cruise speed: 370 km/h (230 mph)
  • Range: 1250 km (795 miles)
  • Service ceiling 7,100 m (23,295 ft)
  • Rate of climb: 8.1 m/s (1,600 ft/min)
  • Wing loading: 161 kg/m (32.9 lb/ft)
  • Power/mass: 0.17 kW/kg (0.10 hp/lb)

Armament

  • 1 x nose-mounted machine gun, either 12.7 mm UBS or 7.62 mm ShKAS
  • up to 200 kg (440 lb) of bombs on two underwing racks

End notes