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Yak-39

Yakovlev Yak-39

 

The Yak-39 is a project of the multipurpose subsonic aircraft that can perform vertical takeoff and landing (VTOL). It was created in Yakovlev Yak-based attack aircraft-38. Then he replaced the famous VTOL Yak-41.

History of the Yak-39

After the creation of the Yak-38 in Yakovlev was decided to begin the development of its improved version. The project is indexed as the Yak-39. Chief Designer was appointed experienced engineer A. Travin.

Yak-39 was not a copy of the base model, it was very different from him. The main difference was the presence of a new attack aircraft onboard multi-mode radar, which allows the aircraft to effectively use the medium-range missiles of class "air-to-air" missiles and anti-ship type with radio guidance on the last part of the trajectory.

Yak-39

Since the project had to be set this radar, it was necessary to completely redo the nose of the aircraft, primarily to increase the volume of the fairing. Thus, the Yak-39 became vysokoplanom. Accordingly, the increased area of ​​the wings. The new wing of the impact on the increase in the volume of fuel tanks and increasing the number of nodes of suspensions up to six compared to Yak-38 (4 suspension).

Combat radius of action is directly dependent on the mode of aircraft in the air. During the run-up to the m 200 1000 kg load range of the Yak-39 450 was km and with a vertical take-off and the same load it is reduced by half - 200 km. In the calculation of the design did not include data on PTAB. By arming the Design Bureau immediately carried the gun GSH-301 (30mm). A estimated maximum bomb load was to be 2500 kg.

Regarding the impact of the complex were considered different options. There were many differences. A sample was taken only proven PC existing aircraft. The main ones were three: H 019 (MiG-29), «flurry» (Su-25T and Ka-50), «Kaira" (fighter-bomber MiG-27).

Yak-39

Though to the actual development of the aircraft started much earlier, officially it began in 1981 year. At the same time he worked on the three variants of the aircraft: fighter, attack and trainer. For the period of 84 86 4 year plan to build a single prototypes and to 1987 was expected to build a special educational and training prototype Yak-39UT. But in the middle of the year 1983 engineers from OKB together with the leadership of the Air Force decided not to build a prototype of the UT, as lacking sufficient training Yak-38U.

According to the initial plan, the "59" product was planned to be used at the base of the power plant - the P28-300 tractor-propeller engine, which also had to lift upgraded Yak-38M to the sky. But in 83, it was proposed to replace it with a more promising P30B-300. This engine was unique in that it combined the elements of two engines: the previously proposed P28-300 and developed for the future VTOL Yak-41-TRDDF Р79В-300. But this idea immediately lost its meaning, because the aircraft was almost built, and the proposed engine was just beginning to be created. Therefore, we returned to the original plan of the power plant. Then the designers decided to improve the lifting engines by adding rotary nozzles to them.

Guide Air in May 1983 years pushed for a CB with the calculation of the first prototype for the second quarter of the year 85, the sample for static testing - six months after the release of 1-prototype, and build a second copy of calculated at the end of the year 1986. According to preliminary LTH and weapons it came that the Yak-39 can be used as interceptor and how to attack. In any case, it was possible effectively used for air defense in the Navy.

Yak-39 cabin

The Design Bureau hoped that a new multi-Yak-39 be able to meet all the requirements of the Navy, but that did not happen. In 1985 the project was shut down in order to increase the efforts to build a more promising option VTOL Yak-41.

 

Yak-39 characteristics:

 

  • Crew: 1 people
  • Weight empty: 12 550 kg

Engines:

  • Hoisting and boosters R28V-300
  • type: single-loop turbofan with thrust vector control
  • number: 1
  • maximum thrust: 1 × 7 100 kg
  • thrust vector control: -90 °
  • Lifting engine RD-41
  • type: single-loop turbofan with thrust vector control
  • number: 2
  • maximum thrust: 2 × 4 100 kg

Flight characteristics

  • Maximum speed at the ground: 900 km / h

Combat radius:

  • during the run-up 200 m and combat load in kg 1 000: 450 km
  • with vertical takeoff and combat load in kg 1 000: 200 km
  • with vertical takeoff and combat load in kg 2 500: 80 km

 

Yak-38 video

 

Aircraft

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Yak 39 was created as a project of a subsonic multipurpose aircraft with vertical take-off and landing. It was created on the basis of the attack aircraft Yak 38. In fact, the 39 Yak was an improved version of the Yak 38, but was not its exact copy. Aircraft were different both externally and with their on-board equipment. In particular, YK 39 had a modern multi-mode radar that allowed the aircraft to use air-to-air missiles *, as well as anti-ship type missiles with radio navigation on the last section of their flight trajectory. At the same time, 3 versions of the aircraft were developed: a fighter, an attack aircraft and a training aircraft. Initially, the powerplant was planned to use the TRD128V - 300 lifting and propulsion engine, but a little later there was a proposal to replace it with a more promising P30B - 300. However, the case stalled because the aircraft was already ready, and the engine was still being built. Because of these delays with the development of the engine, the Air Force did not wait for Yak 39 and in 1985 Yakovlev Design Bureau YNK XX work was stopped to concentrate efforts on other projects.

As for me it's not a particularly successful model of the aircraft, that's why it did not become a manufacturing standard. I even do not like the look, as if a barrel of jet engines. As for the combat use of the ego, it was just not very effective due to the extravagance of soybeans, it could act at small distances. Due to the vertical takeoff and landing he could gobble up a huge amount of fuel significantly reduced range.

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