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Yak-39
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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.

The original plan at the heart of the power plant planned to use "product 59» - lifting and sustainer engine turbojet R28V-300, which also had to lift into the sky upgraded Yak-38M. But 83 year received a proposal to replace it with a more promising R30V-300. This engine was unique in that it combines elements of two engines: the previously proposed R28V-300 and developed for future VTOL Yak-41 - turbofan R79V-300. But this idea is immediately lost its meaning as the plane was almost built, the proposed engine is just starting to be created. So back to the original plan of the power plant. Then the designers decided to improve the lifting engines that add to them turning the nozzle.

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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UC 39 was created as a multi-purpose project of subsonic aircraft with vertical takeoff and landing. It was created on the basis of attack aircraft Yak 38. In fact, the UC is an improved version 39 38 FC, but was not an exact copy. Planes differ both appearance and its avionics. In particular, the UC 39 had advanced multi-mode radar, which allows the aircraft to use missiles of class * air - air *, as well as anti-ship missile with radio guidance on the type of the last portion of their flight trajectory. At the same time developed 3 version of the aircraft: fighter, attack and training aircraft. Initially based power plant planned to be used lifting - boosters TRD128V - 300, but later there was a proposal to replace it with a more promising R30V - 300. However, the case stalled because the plane was ready, and the engine was still under construction. Because of these delays in the fine-tuning of the engine and the Air Force have not waited UC 39 and 1985 year Yakovlev Yak 39 works were discontinued for focusing 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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