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Fifth-generation fighter

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Fifth-generation fighter
A Lockheed Martin F-35 Lightning II (top) and Lockheed Martin F-22 Raptor (bottom), two fifth-generation fighters used by the United States Air Force
Role Fighter aircraft
National origin
First flight 1990 (YF-23)
Introduction 2005 (F-22 Raptor)
Status In service
Developed from Fourth-generation fighter
Developed into Sixth-generation fighter

A fifth-generation fighter is a jet fighter aircraft classification which includes major technologies developed during the first part of the 21st century. As of 2023, these are the most advanced fighters in operation. The characteristics of a fifth-generation fighter are not universally agreed upon, and not every fifth-generation type necessarily has them all; however, they typically include stealth, low-probability-of-intercept radar (LPIR), agile airframes with supercruise performance, advanced avionics features, and highly integrated computer systems capable of networking with other elements within the battlespace for situational awareness and C3 (command, control and communications) capabilities.[1]

As of January 2023, the combat-ready fifth-generation fighters are the Lockheed Martin F-22 Raptor, which entered service with the United States Air Force (USAF) in December 2005; the Lockheed Martin F-35 Lightning II, which entered service with the United States Marine Corps (USMC) in July 2015;[2][3] the Chengdu J-20, which entered service with the People's Liberation Army Air Force (PLAAF) in March 2017;[4] and the Sukhoi Su-57, which entered service with the Russian Air Force (VVS) on 25 December 2020.[5] Other national and international projects are in various stages of development.

Characteristics

The emerging generation of advanced fighter aircraft in the first decades of the 21st century has come to be known as the fifth generation.[6] The defining characteristics of such a fifth-generation fighter are not universally agreed upon, and not every fifth-generation type necessarily has them all. Some generation counts include more than five leading up to the emerging new generation.[7][8]

Whereas previous fourth-generation fighters emphasized maneuverability and close-range dogfighting, typical fifth-generation characteristics include:[8][1]

In order to minimize their radar cross-section (RCS), most fifth-generation fighters use chines instead of standard leading edge extensions and lack canards, though the Sukhoi T-50 has engine intake extensions that seem to function somewhat like canards, and the Chengdu J-20 designers have chosen the agility enhancements of canards in spite of their poor stealth characteristics.[9] They all have twin canted vertical tails (similar to a V-tail) also to minimize side RCS. Most fifth-generation fighters with supermaneuverability achieve it through thrust vectoring.

They all have internal weapon bays in order to avoid high RCS weapon pylons, but they all have external hardpoints on their wings for use on non-stealthy missions, such as the external fuel tanks the F-22 carries when deploying to a new theater.

All fifth-generation fighters have a high percentage of composite materials, in order to reduce RCS and weight.

Software-defined aircraft

All revealed fifth-generation fighters use commercial off-the-shelf main processors to directly control all sensors to form a consolidated view of the battlespace with both onboard and networked sensors, while previous-generation jet fighters used federated systems where each sensor or pod would present its own readings for the pilot to combine in their own mind a view of the battlespace.[10][11][12] The F-22A was physically delivered without synthetic aperture radar (SAR) or situation awareness infra-red search and track. It will gain SAR later through software upgrades.[13] However, any flaw in these complex software systems can disable supposedly unrelated aircraft systems, and the complexity of a software-defined aircraft can lead to a software crisis with additional costs and delays.[14][15] By the end of 2013, the biggest concern with the F-35 program was software, especially the software required for data fusion across the many sensors.[16]

Sukhoi calls their expert system for sensor fusion the artificial intelligence of the Su-57.[17] Flight tests of their integrated modular avionics started in 2017 on a fiber optic networked multicore processor system.[18] The system is not without faults. In December 2020, a malfunction with the computer flight control system caused the first production Su-57 to crash.[19]

An automatic software response to an overheat condition apparently has contributed to a crash of an F-22.[20] Issues with the avionics also contributed to an F-35A crash in 2020.[21]

The F-35 uses software-defined radio systems, in which common middleware controls field-programmable gate arrays.[13] Col. Arthur Tomassetti has said that the F-35 is a "software intensive airplane and software is easy to upgrade, as opposed to hardware."[22]

In order to ease the addition of new software features, the F-35 has adopted a kernel and application separation of security responsibilities.[23]

Steve O'Bryan of Lockheed Martin has said that the F-35 may gain the ability to operate UAVs through a future software upgrade.[24] The USN is already planning to place its Unmanned Carrier-Launched Airborne Surveillance and Strike system under the control of a manned aircraft, to act as a flying missile magazine.[25]

Situational awareness

Main article: Situation awareness

The combination of stealthy airframes, stealthy sensors, and stealthy communications is designed to allow fifth-generation fighters to engage other aircraft before those targets are aware of their presence.[26] Lt. Col. Gene McFalls of the USAF has said that sensor fusion will feed into inventory databases to precisely identify aircraft at a distance.[27]

Sensor fusion and automatic target tracking are projected to give the fifth-generation jet fighter pilot a view of the battlespace superior to that of legacy AWACS (Airborne Warning and Control System) aircraft that may be forced back from the front lines by increasing threats. Therefore, tactical control could be shifted forwards to the pilots in the fighters.[28] Michael Wynne, former Secretary of the United States Air Force, has suggested elimination of the Boeing E-3 Sentry and Northrop Grumman E-8 Joint STARS in favor of more F-35s, simply because so much effort is being made by the Russians and Chinese to target these platforms that are built to commercial airliner standards.[29]

However, the more powerful sensors, such as AESA radar which is able to operate in multiple modes at the same time, may present too much information for the single pilot in the F-22, F-35 and Su-57 to adequately use. The Sukhoi/HAL FGFA offered a return to the two-seat configuration common in fourth generation strike fighters, but this was rejected over cost concerns.[30]

There is ongoing research to apply track-before-detect across sensor fusion in the core CPU to allow fifth-generation fighters to engage targets that no single sensor has by itself detected.[31] Probability theory is used to determine "what data to believe, when to believe and how much to believe".[32]

These sensors produce too much data for the onboard computers to fully process so sensor fusion is achieved by comparing what is observed against preloaded threat libraries that contain known enemy capabilities for a given region.[33] Items that do not match known threats are not even displayed.[34]

Combat cloud

Main articles: network-centric warfare and Cooperative Engagement Capability

Gilmary M. Hostage III has suggested that fifth-generation jet fighters will operate together in a "combat cloud" along with future unmanned combat aircraft,[35] and Michael Manazir has suggested that this might come as quickly as loading a UCLASS with AMRAAMs to be launched at the command of an F-35.[36]

History

Introduction timeline
2005United States F-22A Raptor
2006
2007
2008
2009
2010
2011
2012
2013
2014
2015United States F-35B Lightning II
2016United States F-35A Lightning II
2017China Chengdu J-20A
United States F-35I Lightning II
2018
2019United States F-35C Lightning II
2020China Chengdu J-20B
Russia Sukhoi Su-57
2021
2022
2023
TBAChina Chengdu J-20S
China Shenyang FC-31
India HAL AMCA
Turkey TAI TF-X Kaan
Sweden Flygsystem 2020
Russia Sukhoi Su-75 Checkmate

United States

Technology Demonstrators included the YF-22 – 1990 (2 built), YF-23 – 1990 (2 built), Boeing Bird of Prey – 1996 (1 built), X-36 – 1997 (2 scale models built), X-35 – 2000 (2 built), X-32 – 2001 (1 built).

Lockheed Martin F-22 Raptor

Previous-generation radar low observable (LO) aircraft, also referred to as stealth aircraft, such as the B-2 Spirit and F-117 Nighthawk were designed to be bombers or ground attack aircraft, lacking the active electronically scanned array (AESA) radars, low probability of intercept (LPI) data networks, aerial performance, and air-to-air weapons necessary to engage other aircraft.[37] In the early 1970s, various American design projects identified stealth, speed, and maneuverability as key characteristics of a next-generation air-to-air combat aircraft. This led to the Request for Information for the Advanced Tactical Fighter project in May 1981, which resulted in the F-22.[38]

Lockheed Martin F-35A Lightning II

The USMC is leveraging the USAF's experience with "fifth-generation air warfare" in the F-22, as they develop their own tactics for the F-35.[39]

According to Lockheed Martin in 2004, the only fifth-generation jet fighter then in operational service was their own F-22 Raptor.[2][40] Lockheed Martin uses "fifth-generation fighter" to describe the F-22 and F-35 fighters, with the definition including "advanced stealth", "extreme performance", "information fusion" and "advanced sustainment".[2][41] For unknown reasons, their definition no longer includes supercruise capability, which has typically been associated with the more advanced modern fighters, but which the F-35 lacks.[42] Lockheed Martin attempted to trademark the term "5th generation fighters" in association with jet aircraft and structural parts thereof,[43] and has a trademark for a logo with the term.[44]

The definition of the term fifth-generation fighter from Lockheed Martin has been criticized by companies whose products do not conform to these particular specifications, such as Boeing and Eurofighter, and by other commentators such as Bill Sweetman:[45] "it is misleading to portray the F-22 and F-35 as a linear evolution in fighter design. Rather, they are a closely related pair of outliers, relying on a higher level of stealth as a key element of survivability – as the Lockheed YF-12 and Mikoyan MiG-25, in the 1960s, relied on speed and altitude."[46]

The United States Navy and Boeing have placed the Boeing F/A-18E/F Super Hornet in a "next generation" fighter category along with the F-22 and F-35,[47] as the Super Hornet has a "fifth-generation" AESA radar, modest radar cross-section (RCS) reductions and sensor fusion.[48][49] A senior USAF pilot has complained about fifth-generation claims for the Super Hornet: "The whole point to fifth generation is the synergy of stealth, fusion and complete situational awareness. The point about fifth-generation aircraft is that they can do their mission anywhere – even in sophisticated integrated air defense [IADS] environments. If you fly into heavy IADS with a great radar and sensor fusion, but no stealth, you will have complete situational awareness of the guy that kills you."[50] Michael "Ponch" Garcia of Raytheon has said that the addition of their AESA radars to the Super Hornet provides "90 percent of your fifth-generation capability at half the cost."[51] And a top Boeing official has called their newest 4.5 generation fighters "stealth killers".[52]

China

Chengdu J-20, introduced in 2017
Shenyang FC-31 prototype

By the late 1990s, several Chinese fifth-generation fighter programs, grouped under the program codename J-XX or XXJ, were identified by western intelligence sources. PLAAF officials have confirmed the existence of such a program, which they estimated would enter service between 2017 and 2019.[53][54] By late 2010, two prototypes of the Chengdu J-20 had been constructed and were undergoing high-speed taxi trials.[55] The J-20 made its first flight on 11 January 2011.[56] On 26 December 2015, a new J-20 with serial number 2101 was seen leaving its Chengdu Aviation Corporation factory. It is believed to be the first of the low rate initial production (LRIP) aircraft.[57] 2101 conducted its maiden flight on 18 January 2016.[58]

The J-20 officially entered training unit service in March 2017,[4] becoming the first operational stealth fighter outside of the United States and in Asia.[59] The J-20 underwent testing and exercises in late 2017,[60] and was inducted into PLAAF combat units in 2018.[61][62]

Another stealth fighter design from SAC started to circulate on the internet in September 2011.[63] In June 2012, photos about a possible prototype of F-60 being transferred on highway began to emerge on the internet.[64] This aircraft was named Shenyang FC-31 later, and made its maiden flight on 31 October 2012.[65] A more refined version of the FC-31 is dubbed "J-35".[66]

Russia

Sukhoi Su-57 of the Russian Air Force
A static prototype of the Sukhoi Su-75 Checkmate at the MAKS Airshow 2021

Technology demonstrators included the Mikoyan Project 1.44 – 1998 (1 built) and Su-47 – 1997 (1 built).

In the late 1980s, the Soviet Union outlined the need for a next-generation aircraft to replace its fourth-generation jet fighters, the Mikoyan MiG-29 and Sukhoi Su-27, in front line service. To meet the characteristics for the next-generation aircraft, work was underway on two aircraft projects: the twin-engined delta canard Sukhoi Su-47 with forward-swept wings and the Mikoyan Project 1.44. However, due to the dissolution of the Soviet Union and lack of funds, both remained only as technology demonstrators.

After 2000, the Russian Defence Ministry initiated a new fighter competition known as "PAK FA" (Template:Lang-ru, Template:Lang-ru) to develop a next-generation fighter for the Russian Air Force, with Sukhoi and MiG as the main competitors. Sukhoi came up with its heavier, two-engine T-50 proposal (now Sukhoi Su-57) while Mikoyan proposed a light, single-engine Mikoyan LMFS design, based on the former MiG-1.44 project.[67] Sukhoi won the competition and in 2002, it was selected to lead the development of Russia's next-generation fighter based on the T-50 design. Later development of the multirole Mikoyan LMFS were continued from MiG funding.[68] However Mikoyan LMFS program was also cancelled and replaced by similar Sukhoi Checkmate program.

Russia's first fifth-generation aircraft, the Sukhoi Su-57, will replace its aging MiG-29s and Su-27s.[69][70] The Su-57 first flew on 29 January 2010. The first production Su-57 was delivered to the Russian Air Force on 25 December 2020.[71]

The Mikoyan PAK DP is another proposed fifth-generation fighter, being developed to replace the MiG-31.[72][73][74][75] The project began in 2010, and "According to Russian news reports, the MiG-41 will be equipped with stealth technology, reach a speed of Mach 4–4.3, carry anti-satellite missiles, and be able to perform tasks in Arctic and near-space environments."[76]

Russia unveiled a prototype of the single-engine Sukhoi Su-75 Checkmate Light Tactical Aircraft in July 2021 at the biennial MAKS (air show), with maiden flight initially expected in 2023 (subsequently delayed to at least 2024). The fighter is mainly designed for export and is expected to be less costly than 2-engine competitors.[77]

India

India is independently developing a twin-engine fifth-generation supermaneuverable stealth multirole fighter, called the HAL Advanced Medium Combat Aircraft (AMCA). It is being developed and designed by the Aeronautical Development Agency and will be manufactured by a SPV with initial prototypes produced by Hindustan Aeronautics Limited. As of 2022, the AMCA prototype is under construction, with a first flight of the prototype expected by 2025.[78][79][80]

In early 2018, India pulled out of the parallel project called FGFA, a fifth-generation derivative of the Sukhoi Su-57, which it alleged did not meet requirements for stealth, combat avionics, radars and sensors by that time.[81] The completed FGFA was to include 43 improvements over the Su-57, including stealth, supercruise, advanced sensors, networking and combat avionics.[82][83]

However many analysts have questioned the feasibility of India's ability to independently develop a fifth generation fighter aircraft as India lacks the industrial base and technical capabilities to do so, particularly a lack of research and design expertise.[84] India also lacks a robust military industrial base to manufacture the aircraft in large numbers.[85]

Turkey

TAI TF-X Kaan during the runway tests at TAI's facilities in Ankara, on March 17, 2023[86][87]

The TAI TF-X Kaan,[88][89] alternatively named TF ("Turkish Fighter"), or in Turkish as Milli Muharip Uçak (National Combat Aircraft),[86] abbreviated as MMU,[86] is a stealth, twin-engine, all-weather, fifth generation air superiority fighter in development by Turkish Aerospace Industries (TAI) and BAE Systems as its sub-contractor. The TF-X is planned to replace the F-16 Fighting Falcon aircraft of the Turkish Air Force and to be exported to foreign states. It was officially announced that the TF-X's prototype will be rolled out on 18 March 2023, and make its first flight by the end of 2023.[90][91][92][93][94][95] The taxiing and ground running tests of the prototype began two days before the scheduled roll-out, on March 16, 2023.[86][96][97][98][99] Its maiden flight is scheduled to take place in 2023.[100][101] It was officially given the name "Kaan" on May 1, 2023.[88][89][87]

In May 2023, during an air show in Turkey, Temel Kotil, the CEO of TAI, warned that the price tag of the aircraft may be a little over his 2021 promise of $100m per unit.[102] He expects TAI to deliver twenty Block 10 aircraft to the Turkish Air Force in 2028, which is planned to rise to a delivery rate of two aircraft per month by 2029, generating $2.4bn in annual revenues for TAI.[102]

Sweden

Saab's Flygsystem 2020 is a program to develop a fifth generation fighter.

Japan

Mitsubishi X-2 Shinshin

Japan developed a prototype of a stealth jet fighter called the Mitsubishi X-2 Shinshin, previously referred to as the ATD-X. At the beginning of the twenty-first century, Japan, seeking to replace its aging fleet of fighter aircraft, began making overtures to the United States on the topic of purchasing F-22 fighters for their own forces.[103] However the U.S. Congress had banned the exporting of the aircraft in order to safeguard secrets of the aircraft's technology such as its extensive use of stealth; this rejection necessitated Japan's development of its own modern fighter, to be equipped with stealth features and other advanced systems.[104]

A mock-up of the X-2 Shinshin was constructed and used to study the radar cross section in France in 2009. The first prototype rolled out in July 2014 and the aircraft made its first flight on 22 April 2016. By July 2018, Japan had gleaned sufficient information, and decided that it would need to bring on international partners to complete this project. Several companies have responded.[105]

Japan has signed a contract with Mitsubishi Heavy Industries to develop a sixth-generation fighter called Mitsubishi F-X.

Comparison

Type Origin Class Role Introduced In service Total Notes
List of fifth-generation fighters
Lockheed Martin F-22A Raptor  United States Jet Fighter 15 December 2005 ? 195 —
Lockheed Martin F-35B Lightning II  United States Jet Fighter 31 July 2015 ? ? STOVL
Lockheed Martin F-35A Lightning II  United States Jet Fighter 2 August 2016 ? ? CTOL
Chengdu J-20A  China Jet Fighter 9 March 2017 ? ? —
Lockheed Martin F-35C Lightning II  United States Jet Fighter 28 February 2019 ? ? CATOBAR
Chengdu J-20B  China Jet Fighter 8 July 2020 ? ? —
Sukhoi Su-57  Russia Jet Fighter 25 December 2020 ? 21 —
Chengdu J-20S  China Jet Fighter In development — ? In development since at least October 2021.
Shenyang FC-31  China Jet Fighter In development — ? First flight on October 31, 2012; 12 years ago (2012-10-31).
Lockheed Martin F-22B Raptor  United States Jet Fighter Cancelled — ? Cancelled in 1996; 28 years ago (1996).

See also

References

Notes

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Bibliography

  • Baker, David (2018). Fifth Generation Fighters. Mortons Media Group.
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