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Most Powerful Fighter Jet - This is a product of PAK FA (Russian: ПАК FA, abbreviated: Пер чный ави конный клекс фронтовой авиазии, romanized: Проспективный Авиационный Фронтовой Авиации, programa'lin. Cheaper than LKM (Mikoyan project 1.44/1.42). aircraft - T-50. Su-57 - the first aircraft in the Russian military service, developed with secret technologies and designed to form the basis of a family of secret fighters.

A versatile fighter capable of air combat as well as ground and naval attacks, the Su-57 combines stealth, supersonic, supercruise, integrated avionics and large internal payload capacity.

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The aircraft is expected to replace the MiG-29 and Su-27 in Russian military service and has been sold for export. The first prototype aircraft flew in 2010, but the program suffered from development delays due to various structural and technical problems encountered during testing, including a crash prior to the launch of the first production aircraft. After several delays, the first Su-57 was grounded by the Russian Air Force (VKS).

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In 1979, the Soviet Union stressed that the next generation fighter should be deployed in the 1990s. The program became the I-90 (Russian: И-90, abbreviated: Истребитель 1990 - х годов, lit. "Fighter of the 1990s") and required the fighter to be "multifunctional" (ie, multirole) as its main base. strike capability, and will eventually replace the MiG-29 and Su-27 in tactical aviation service. Two more projects were developed to meet these requirements: MFI (Russian: МФИ, short: Многофсиональный фронтовой истребитель, lit.: LFI, Л short: LFI, Л short: LFI, Л lit.Л'), with conceptual work starting in 1983 .

Although not involved in MFI, Sukhoi began its own program in 1983 to develop technology for a next-generation fighter, resulting in the advanced S-32 experimental aircraft, later modified to the S-37 and Su-47. Due to a lack of funds following the collapse of the Soviet Union, MFI was delayed several times and the first flight of the MiG 1.44/1.42 prototype did not occur until 2000, nine years behind schedule.

Due to high costs, the MFI and LFI were eventually canceled when the Russian Ministry of Defense began work on a new war program; In 1999, the ministry launched the PAK FA or I-21 program, a tender was announced in April 2001.

Due to Russia's financial difficulties, the program aims to control costs by producing five multi-purpose fighters that will replace the Su-27 and MiG-29. Further cost-saving measures include a size between the Su-27 and MiG-29 and a smaller normal weight compared to the MiG LKM's 28.6 tonnes (63,000 lb) and the Su-47's 26.8 tonnes (59,000 lb). .

Sukhoi Su 57

Sukhoi's approach to the PAK FA competition differs from Mikoyan's; and Mikoyan offered three design bureaus (Mikoyan, Sukhoi, and Yakovlev) to serve as designers, with Sukhoi's proposal to be the lead designer from the start and include a joint working agreement. From tire development and manufacturing cycle, propulsion and avionics suppliers to research facilities. In addition, the two companies have different design philosophies for the aircraft. The E-721 Mikoyan is smaller and cheaper, with a typical takeoff weight of 16–17 tons (35,000–37,000 lb) and powered by 10–11 tons of steam (98.1–108 kN, 22,000–24 Klimov VK-10M engines, 300 lb) each throw In contrast, the Sukhoi T-50 will be relatively larger and more capable, with a typical takeoff weight of 22–23 tons (49,000–51,000 lb) and powered by Lyulka-Saturn AL-41F1 engines. maximum thrust in class is 14.5 tons (142 kN, 32,000 lb).

In April 2002, the Ministry of Defense selected Sukhoi from Mikoyan as the winner of the PAK FA competition and headed the new aircraft design bureau.

In addition to the merits of the proposal, Sukhoi's experience in the 1990s, the successful development of various Su-27 derivatives and numerous exports ensure its financial stability.

Mikoyan continued to develop the E-721 as the LMFS (Russian: ЛМФС, abbreviated: Light Multipurpose Front-End Aircraft, lit.

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PAK FA's research and development program is called Stolitsa (Russian: Stolitsa, lit. 'Capital'). In 2002, Alexander Davidko was selected as the designer of the T-50 at Sukhoi.

Novosibirsk Aviation Association (NAPO) and Komsomolsk-on-Amur Aviation Association (KnAAZ) will produce the new multi-role fighter, with KnAAZ conducting final assembly at Komsomol-on-Amur.

Taking part in the competition held in 2003, the Scientific and Production Center of Technocomplex, the Ramskoe Instrument Design Bureau, the Tikhomirov Instrument Design Research Institute (NIIP), the Ural Optical and Mechanical Plant (UOMZ) in Yekaterinburg, and the Polet company in Nizhny took part. Novgorod and Ktral Scientific Research Radio Engineering Institute in Moscow were selected to develop the PAK FA avionics kit. In April 2004, Lyulka-Saturn NPO (now Saturn NPO) was signed as the contractor for the AL-41F1 engine under development designation izdeliye 117.

Sukhoi uses the existing airfield as a testing ground for various subsystems and concepts; The Su-47 tested the internal weapons bay, and the Su-27M prototype served as a testbed for flight control and engine systems.

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To reduce development risk and spread costs, as well as to bridge the gap with surviving fourth-generation fighters, Sukhoi used some of the T-50's advanced technologies and features, such as propulsion and avionics. The Su-27, known as the T-10BM (Russian: БМ, abbreviated: большай модерный ки, lit. "Great Modernization"), was eventually purchased by the Russian Ministry of Defense in 2009 and entered service as the Su-35S. 2014.

In December 2004, the design and conceptual design of the T-50 was approved and approved by the Ministry of Defense; State funding for the program began in 2005 and increased dramatically in 2006.

On August 8, 2007, Alexander Zelin, Commander-in-Chief of the Russian Air Force, reported to Russian news agencies that the development phase of the program had been completed and construction of the first aircraft for flight testing would begin, with plans to build three flying T-50 prototypes. Built in 2009.

Since the early stages of the PAK FA program, Russia has sought foreign partnerships in the project to increase funding for its development and secure large export orders.

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On 18 October 2007, Russia and India signed an agreement to jointly develop a derivative of the PAK FA, known as the Fifth Generation Fighter Aircraft (FGFA), for Sukhoi and Hindustan Aeronautics Limited (HAL).

In September 2010, India and Russia agreed on a preliminary design agreement in which each country would invest $6 billion; A memorandum of understanding for the initial design was signed in December 2010, and development of the FGFA is expected to take 8-10 years.

However, in 2014, the Indian Air Force began to worry about performance, cost and division of labor. India finally withdrew from the partnership in 2018.

T-50 support flights have been delayed several times since early 2007 after encountering unspecified technical problems. In August 2009, Alexander Zelin admitted that the problem of gynecology and technical research has not yet been solved.

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On February 28, 2009, Sukhoi CEO Mikhail Pogosyan announced that the airfield was almost complete and the first prototype would be ready in August 2009.

On August 20, 2009, Poghosyan announced that the first flight would take place. Konstantin Makiko, deputy head of the Moscow-based Center for Strategic and Technological Analysis, said the plane would make its first flight in January or February "with delays" and that commercial production would take five to three years. . .

Further flight tests were halted when Deputy Prime Minister Sergei Ivanov announced in December 2009 that the first tests would begin in 2010.

The first successful taxi test was completed on December 24, 2009, and the first flight of the first T-50-1 prototype aircraft took place on January 29, 2010.

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Piloted by Sukhoi test pilot Sergey Bogdan, the aircraft's 47-minute auxiliary flight took place at the Zhemgi KNAAPO airport in the Far East of Russia.

Prototype development will be slower than originally planned; By October 2013, the test program had accumulated more than 450 flights across five aircraft.

A total of t flying and three non-flying T-50 prototypes will be built for preliminary flight tests and field trials.

Initially, the program was to have up to six prototypes before serial production began; however, testing will show that early prototypes lack fatigue life, with large structural cracks forming in the fuselage.

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The aircraft was then structurally redesigned, with changes including increased use of composite materials, a strengthened fuselage to meet full-cycle requirements, a longer tail "shock" and a slightly larger wingspan; the sixth flying prototype was the first of the redesigned "stage two" aircraft, resulting in the first five prototypes being considered "stage one" vehicles and requiring additional structural strengthening to continue flight testing.

The last two flying prototypes are production test articles of the Su-57 aircraft with a full mission system on board.

At the same time, the "second stage" structural modification reduced the weight from the required strength

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