|Role||Stealth air superiority fighter / multirole combat aircraft|
|Manufacturer||Chengdu Aerospace Corporation|
|First flight||11 January 2011|
|Status||In development / flight testing|
|Primary user||People's Liberation Army Air Force|
|Number built||3 prototypes|
The Chengdu J-20 (simplified Chinese: 歼-20; traditional Chinese: 殲-20) is a stealth, twin-engine fifth-generation fighter aircraft prototype being developed by Chengdu Aerospace Corporation for the Chinese People's Liberation Army Air Force (PLAAF). The J-20 made its first flight on 11 January 2011, and is expected to be operational in 2017–2019.
China's J-20 platform has the potential to be a capable, long-range strike system in the Asia-Pacific region, but a number of technical challenges will need to be overcome before production can begin.
Origins of the J-20 came from the J-XX program which was started in the late 1990s. A proposal from Chengdu Aerospace Corporation, designated “Project 718”, had won the PLAAF endorsement following a 2008 competition against a Shenyang proposal that was reportedly even larger than the J-20.
On 11 January 2011, the J-20 made its first flight, lasting about 15 minutes, with a Chengdu J-10S serving as the chase aircraft. After the successful flight, a ceremony was held, attended by the pilot, Li Gang, Chief Designer Yang Wei and General Li Andong (Deputy-Director of General Armaments).
On 17 April 2011, a second test flight of an hour and 20 minutes took place. On 5 May 2011, a 55-minute test flight was held that included retraction of the landing gear. On 26 February 2012, a J-20 performed various low-altitude maneuvers. On 10 May 2012, a second prototype underwent high speed taxiing tests, and flight testing that began later that month.
On 20 October 2012, photographs of a new prototype emerged, featuring a different radome, which was speculated to house a Type 1475 (active electronically scanned array) radar. In March 2013, images of the side weapon bays appeared, including a missile launch rail. On 16 January 2014, a J-20 prototype was revealed, showing a new intake and stealth coating, as well as redesigned vertical stabilizers, and a system that appeared to be an Electro-Optical Targeting System.
The J-20 has a long and wide fuselage, with the chiseled nose section and a frameless canopy resembling that of the F-22 Raptor. Immediately behind the cockpit are low observable intakes. All-moving canard surfaces with pronounced dihedral are placed just behind the intakes, and behind these, leading edge extension merging into delta wing with forward-swept trailing edges. The aft section features twin, outward-canted all-moving fins, short but deep ventral strakes and conventional round engine exhausts.
A research paper described high instability as important design criterion for the J-20, which requires sustained pitch authority at a high angle-of-attack. The canard-delta configuration was selected as the required pitch authority cannot be achieved by a conventional tailplane. An all-moving canard is capable of deflecting to the same magnitude but opposite to the angle-of-attack, thereby maintaining control. The delta canard configuration also allows good supersonic performance, excellent supersonic and transonic turn performance, and better short field landing performance compared to the conventional delta wing design.
Leading edge extensions and body lift are incorporated to enhance performance in a canard layout. This configuration is said to generate 1.2 times the lift of an ordinary canard delta, and 1.8 times more lift than an aircraft that purely relies on its wing for lift. This allows the use of a smaller wing, reducing supersonic drag without compromising transonic lift-to-drag characteristics that are crucial to the aircraft's turn performance.
The prototype's engine is believed to be the WS-10 and the AL-31 derivative. Western analysts believe that China is currently working on an advanced domestic turbofan engine similar in performance to the Pratt & Whitney F119 to power the J-20 and will use Russian engines for the time being. Some believe that China will use the AL-41 117S through the purchase of the Su-35 as an interim engine for earlier production models of J-20, although China has denied any deal. At the 2012 Zhuhai Air Show, Russia approached China with its 117S engine in an unsuccessful attempt to sell the Su-35.
The production version of the J-20's is speculated to feature the WS-15, a turbofan engine producing 18 tons of thrust in development since the early 1990s. According to Global Security, the engine core, composed of high pressure compressors, the combustion chamber, and high pressure turbines were successfully tested in 2005. An image of the core appeared in the 2006 Zhuhai Air Show.
In 2012, China announced a $24 billion investment program to catch up in the field of military turbofans. At the end of 2012, the Aviation Industry Corporation of China (AVIC) announced several breakthroughs in producing alloys for engine turbines, reaching standards used by leading global engine manufacturers.
The aircraft features a glass cockpit, with two main large color liquid crystal displays (LCD) situated side-by-side and three smaller auxiliary displays, and a wide-angle holographic head-up display (HUD).
Two smaller lateral weapon bays behind the air inlets are intended for short-range AAMs (PL-10). These bays allow closure of the bay doors prior to firing the missile, thus enhancing stealth.
Analysts noted that J-20's nose and canopy use similar stealth shaping design as the F-22, yielding similar signature performance in a mature design at the front, while the aircraft's side and axi-symmetric engine nozzles may expose the aircraft to radar. One prototype has been powered by WS-10G engines equipped with a different jagged-edge nozzles and tiles for greater stealth.
Others have raised doubts about the use of canards on a low-observable design, stating that canards would guarantee radar detection and a compromise of stealth. However, canards and low-observability are not mutually exclusive designs. Northrop Grumman's proposal for the U.S Navy's Advanced Tactical Fighter (ATF) incorporated canards on a stealthy airframe. Lockheed Martin employed canards on a stealth airframe for the Joint Advanced Strike Technology (JAST) program during early development. McDonnell Douglas and NASA's X-36 featured canards and was considered to be extremely stealthy. Radar Cross Section can be further reduced by controlling canard deflection through flight control software, as is done on the Eurofighter.
The diverterless supersonic inlet (DSI) enables an aircraft to reach Mach 2.0 with a simpler intake than traditionally required, and improves stealth performance by eliminating radar reflections between the diverter and the aircraft's skin. Analysts have noted that the J-20 DSI reduces the need for application of radar absorbent materials. Additionally, the "bump" surface reduces the engine's exposure to radar, significantly reducing a strong source of radar reflection.
The first test flight coincided with a visit by United States Secretary of Defense Robert Gates to China, and was initially interpreted by Pentagon officials as a possible signal to the visiting U.S. delegation. After meeting with Hu Jintao, Secretary Gates told reporters in Beijing, "I asked President Hu about it directly, and he said that the test had absolutely nothing to do with my visit and had been a pre-planned test." Jin Canrong, a professor at Renmin University who specializes in China-U.S. relations, suggested that President Hu being unaware of the test raised questions about the nature of civilian control of the Chinese military. Michael Swaine, an expert on the PLA and United States - China military relations, explained that it is possible that "senior officials did not know that this flight test would occur on this precise day", and was not necessarily an effort to insult the U.S. delegation or embarrass President Hu. Decisions regarding military aircraft development are routinely managed by engineers and mid-level officials more than by civilian or military leadership. Coupled with the initially limited Chinese media coverage of the event, it is likely that the test may not have been considered significant enough to warrant notifying President Hu.
The U.S. Director of National Intelligence James R. Clapper testified that the United States knew about the program for a "long time" and that the test flight was not a surprise. On the other hand, a 2012 report by the U.S.‐China Economic and Security Review Commission suggests that the United States may have underestimated the speed of development of the J-20 and several other Chinese military development projects.
Robert Gates questioned how stealthy the J-20 may be, but also stated that its development potentially "put some of our capabilities at risk, and we have to pay attention to them, we have to respond appropriately with our own programs."
As photographs of the prototype surfaced, observers including Bill Sweetman indicated that the J-20 may be a long-range interceptor, similar to the role of the General Dynamics F-111 Aardvark or the MiG-25 with stealth, although this conflicts with the "J" designation traditionally reserved by the PLAAF for air superiority fighters. Sweetman also indicated that the J-20 may have lower supercruise speed and agility, yet greater range, than a F-22 Raptor or PAK FA, but may also have larger weapons bays and carry more fuel. Others have indicated the J-20 may be a light supersonic bomber.
Six possible roles have been outlined for the J-20: a long-range interceptor, an air-combat and escort fighter, a theater strike fighter, a long range reconnaissance aircraft, an electronic attack platform, and an anti-satellite weapon launch platform. Early variants could be employed as strike aircraft, or interceptors, with later variants becoming more adept at air superiority as more powerful engines become available.
Loren B. Thompson speculated that the combination of forward stealth and long range allows the J-20 to attack surface targets while the United States lacks sufficient airbases in the area to counter such attacks, and that a long-range maritime strike aircraft may cause the United States more concern than a short range air-superiority fighter like the F-22.
In its 2011 Annual Report to Congress, the Pentagon described the J-20 as "a platform capable of long range, penetrating strikes into complex air defense environments."
Technology transfer allegations
In April 2009, a Wall Street Journal report indicated that, according to American government officials, information from the F-35 was compromised by unknown attackers allegedly appeared to originate from China. There is some speculation that the compromise of the Lockheed Martin F-35 program may have helped in the development of the J-20.
Data from
- Crew: one (pilot)
- Length: 20.3 m (66 ft 7 in)
- Wingspan: 12.88 m (42 ft 3 in)
- Height: 4.45 m (14 ft 7 in)
- Wing area: 73 m2 (790 sq ft)
- Max takeoff weight: 36,288 kg (80,001 lb) upper estimate
- PL-10 SRAAM
|Artist's rendering of the J-20.|
- Aircraft of comparable role, configuration and era
- Related lists
- "Chinese Stealth Fighter Makes First Flight" Fox News, 11 January 2011.
- Sweetman, William. "China’s J-20 Stealth Fighter In Taxi Tests." Aviation Week. 3 January 2011. Retrieved 30 June 2011.
- "中国歼20战机再出新编号 2003号机去向成谜(图)_新浪军事". Slide.mil.news.sina.com.cn. 1999-12-31. Retrieved 2014-03-20.
- "Chengdu J-20 – China’s 5th Generation Fighter." Defense Update. Retrieved 23 January 2011.
- "《面对面》 对话何为荣： 中国正在研制第四代战机" Xinhua News Agency, 2 February 2013
- Erickson, Andrew and Gabe Collins. "China’s New J-20 Fighter: Development Outlook and Strategic Implications." andrewerickson.com, 17 January 2011. Retrieved 23 January 2011.
- "中国空军选定下一代战机由611所方案胜出". Warchina.com. Retrieved 10 June 2013.
- "Chinese Stealth Fighter Unveiled?" Australian Aviation. 30 December 2010.
- "Video: Chinese Stealth Fighter." Wall Street Journal. Retrieved 10 January 2011.
- "Chinese Stealth Fighter Appears to Make First Test Flight." The Wall Street Journal. Retrieved 23 January 2011.
- Wall, Robert. "J-20 Completes First Flight." Aviation Week & Space Technology. Retrieved 30 June 2011.
- "Chinese J-20 Fighter First Flight Ceremony." AirForceWorld.com. Retrieved 15 March 2011.
- "China stealth fighter "appears" to have made second flight." Reuters. Retrieved 21 August 2012.
- "Chinese J-20 stealth fighter makes third flight; landing gears folded." China Defence Mashup, 5 May 2011.
- "Video: J-20 Combat Maneuver Tests.". YouTube. 26 February 2012. Retrieved 10 June 2013.
- "Video: J-20 Prototype 2002 Ground Tests." Youtube. 30 May 2012. Retrieved 25 February 2014.
- Axe, David. "China Flies New Stealth Fighter as Problems Plague U.S. Jets." Wired, 16 May 2012.
- "This might be China's third J-20 stealth fighter.". foreignpolicy.com. 23 October 2012. Retrieved 10 June 2013.
- Cenciotti, David. "China's new stealth fighter's missile launch rails prove Beijing can improve U.S. technology." The Aviationist, 26 March 2013. Retrieved 10 May 2013.
- "J-20." Baidu. Retrieved 25 February 2014.
- Axe, David. "China’s Latest Stealth Fighter Prototype Has, Well, Actual Stealth Features.". medium.com. Retrieved 17 January 2014.
- "Upgraded, third prototype." The Aviationist, 21 February 2014
- "J-20 Prototype 2011 Taxi Test." Youtube. Retrieved 24 February 2014.
- Kopp, Dr. Carlo and Peter Goon. "Chengdu J-XX Stealth Fighter Prototype." ausairpower.net, 1 January 2011.
- "Worldview Report | Vol. 14" digitalglobe.com 2 January 2013
- "Super Agile aircraft and method of flying it in supernormal flight." Google Patents. Retrieved 20 March 2013
- Probert, B. "Aspects of Wing Design for Transonic and Supersonic Combat." NATO. Retrieved: 23 January 2011.
- Neblett, Evan et al. "Canards." AOE 4124: Configuration Aerodynamics, Department of Aerospace and Ocean Engineering, Virginia Tech, 17 March 2003. Retrieved: 28 November 2009.
- "一种小展弦比高升力飞机的气动布局研究 A High Lift Low-Aspect Ratio Aerodynamic Configuration" sina.com Retrieved 20 March 2013
- "一种小展弦比高升力飞机的气动布局研究 A High Lift Low-Aspect Ratio Aerodynamic Configuration" baidu.com Retrieved 20 March 2013
- "Translation of article 一种小展弦比高升力飞机的气动布局研究" http://www.defence.pk Retrieved 20 March 2013
- "An Initial Assessment of China's J-20 Stealth Fighter." The Jamestown Foundation, 6 May 2011
- Majumdar, Dave. "J-20 a ‘wake-up call,’ former intel chief says." AirForce Times, 13 February 2011.
- Johnson, Reuben F. "China’s development of fighter jets relies on Russian systems." Washington Times, 25 August 2011.
- "Russia Is About To Give Valuable Aviation Secrets To China."
- "中国否认俄媒体有关可能购买48架苏-35歼击机的报道" chinese.ruvr.ru 5 December 2012
- "俄军企称希望向中国出口117S大推力发动机" sina.com 5 December 2012
- "China Aerospace Propulsion Technology Summit.". International Aircraft Engine Association, 19 June 2012.
- Fisher, Richard, Jr. "October Surprises in Chinese Aerospace." International Assessment and Strategy Center, 9 January 2013
- "WS-15" Global Security, 11 July 2011
- "The 'Long Pole in the Tent': China’s Military Jet Engines.". The Diplomat. 7 December 2012. Retrieved 10 June 2013.
- "China makes progress in developing alloy for airplane engines.". Focustaiwan.tw. 21 December 2012. Retrieved 10 June 2013.
- "China Has Made Great Breakthrough in High-temperature Alloy to Biggest Military Jet Engine." news.chinatungsten.com
- "Not so hidden dragon – China’s J-20 assessed." Royal Aeronautical Society. Retrieved 20 December 2012.
- "Photo: China’s J-20 Stealth Fighter Head-On." defensetech.org. Retrieved 20 December 2012.
- "Is China Stealing America’s Top Stealth Fighter Jet Secrets?" GIZMODO Australia. Retrieved 20 December 2012.
- "China claims innovation in J-20 weapons bay design" AINonline, Retrieved March 2, 2014
- Axe, David. "Chengdu J-20: China’s First Stealth Fighter." warisboring.com, 29 December 2010.
- Waldron, Greg. "Long March: China’s fifth-generation fighter is years away." Flight International. Retrieved 23 January 2011.
- Hodge, Nathan. "China’s J-20 Fighter: Stealthy or Just Stealthy-Looking?" The Wall Street Journal, 19 January 2011.
- "F-23A & NATF-23" yf-23.net, 15 January 2013
- "NATF-23 diagram in hi-rez." Aerospace Project Review 15 January 2013.
- Sweetman, Bill. "From JAST To J-20". Aviation Week, 14 January 2011.
- Sweetman 2005, p. 122–124.
- "Agility+Stealth = X-36: formula for an advanced fighter " Design News. 14 January 2013
- "Faq Eurofighter (translation)". Retrieved 29 November 2009.
- Rosenkranz, Martin. "Austrian Eurofighter committee of inquiry." pp. 76–77. (English translation). Google. Retrieved 28 November 2009.
- Hehs, Eric. "JSF Diverterless Supersonic Inlet." LockMart, 15 July 2000.
- "J-20's Stealth Signature Poses Interesting Unknowns." Aviation Week. Retrieved 13 January 2013
- "Fast History: Lockheed's Diverterless Supersonic Inlet Testbed F-16" aviationintel.com, 13 January 2013
- Wines, Michael and Elisabeth Bumiller. "Test Unrelated to Gates Visit, China Says." The New York Times, 12 January 2011. Retrieved 13 January 2011.
- Barnes, Julian E. "Gates, China Discuss Nuclear Strategy." The Wall Street Journal, 12 January 2011. Retrieved 12 January 2011.
- Stewart, Phil. "Gates: China confirms stealth jet test-flight." Reuters, 11 January 2011. Retrieved 26 January 2011.
- Bumiller, Elisabeth and Michael Wines. "Test of Stealth Fighter Clouds Gates Visit to China." The New York Times, 11 January 2011.
- Clapper, James R. "World Wide Threats Hearing" Director of National Intelligence, 10 February 2011.
- "Indigenous Weapons Development in China’s Military Modernization." U.S.‐China Economic and Security Review Commission Staff Research Report, 2012.
- Bumiller, Elisabeth. "U.S. Will Counter Chinese Arms Buildup." The New York Times, 8 January 2011.
- Sweetman, Bill. "J-20 – The Dragon Gets Airborne." Aviation Week, 11 January 2011.
- Sweetman, Bill. "Fog Lifts At Chengdu." Aviation Week & Space Technology. Retrieved 30 June 2011.
- Axe, David. "China’s Over-hyped Stealth Jet." The Diplomat, 7 January 2010.
- Sweetman, Bill. "China's Stealth Striker." Aviation Week. Retrieved 30 June 2011.
- Trimble, Stephen. "J-20: China's ultimate aircraft carrier-killer?" Flight International, 9 February 2012.
- Kopp, Carlo. "The Strategic Impact of China's J-XX Stealth Fighter" Air Power Australia, 9 January 2011
- Thompson, Loren B. "Chinese Fighter Test Embarrasses Gates, Casts Doubt On Goals." Lexington Institute, 13 January 2011.
- "Annual Report to Congress: Military and Security Developments Involving the People’s Republic of China, 2011." Office of the Secretary of Defense, 6 May 2011. Retrieved 16 February 2012.
- Groman, Siobhan, August Cole and Yochi Dreazen. "Computer Spies Breach Fighter-Jet Project." Wall Street Journal, 21 April 2009. Retrieved: 23 January 2011.
- by Brian Hsu. "China Claims Innovation in J-20 Weapons Bay Design | Aviation International News". Ainonline.com. Retrieved 2014-03-20.
- Kopp, Carlo. "The Strategic Impact of China's J-XX (J-20) Stealth Fighter." Air Power Australia NOTAM #70, 9 January 2011.
- Kopp, Carlo and Peter A. Goon. "Chengdu J-XX (J-20) Stealth Fighter Prototype; A Preliminary Assessment." ausairpower.net Technical Report APA-TR-2011-0101, January 2011.
- Rupprecht, Andreas. "Enter the Dragon: The Chengdu J-20." Combat Aircraft Monthly, (Ian Allan Publishing), Issue 12/3, March 2011, pp. 34–41.
- Sweetman, Bill. Lockheed Stealth. Minneapolis, Minnesota: Zenith Press, 2005. ISBN 0-76031-940-5.
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