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J-11

Shenyang Aircraft · Fighter / Attack · China · Modern (1992–2009)

J-11 — Fighter / Attack
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The Shenyang J-11 (Chinese designation '歼-11') is a twin-engine, single-seat, supersonic air-superiority fighter built by Shenyang Aircraft Corporation (SAC) as a Chinese-licensed — and later indigenised — derivative of the Russian Sukhoi Su-27 Flanker. It entered People's Liberation Army Air Force (PLAAF) service in 1998 and remains one of China's principal air-superiority and multirole platforms. The family spans licensed Russian Su-27SK production through indigenous Chinese marks, culminating in the J-11D and the related J-15 and J-16. More than 280 J-11-family airframes have been built, with production at SAC's Shenyang facility continuing across several variants. By 2026 the J-11 family will exceed J-10 numbers, making it the largest indigenous Chinese fighter line.

Dimensionally the J-11 follows its Su-27 ancestor closely: roughly 71 ft (21.9 m) long with a 50-ft (15.2 m) wingspan. Empty weight is around 36,000 lb; maximum take-off weight runs from 76,000 lb on the J-11A to over 80,000 lb on the J-11B and J-11D. Initial J-11A airframes use two Russian-licensed AL-31F afterburning turbofans rated at roughly 17,800 lbf dry and 27,600 lbf in afterburner. Later J-11B and J-11D aircraft fly behind Chinese-developed WS-10 'Taihang' turbofans producing 21,500–22,500 lbf each in afterburner. Top speed is Mach 2.35 (around 1,550 mph at altitude), service ceiling 62,500 ft, and typical combat radius 800 nmi. Distinctive features include the Su-27-derived blended-wing-body airframe; a Chinese-developed AESA radar on the J-11D (replacing the Russian Irbis-E PESA); Chinese PL-12 and PL-15 air-to-air missiles among other weapons; and a glass cockpit with updated mission systems on the B and D marks.

The J-11 line traces a clear arc from licensed Russian production to indigenous Chinese manufacture. The J-11A (1998–2007) was licensed Su-27SK production at SAC. The J-11B (2007+) introduced Chinese WS-10 engines, Chinese radar and mission systems, and Chinese-built weapons. The J-11D (2015+) added an AESA radar and updated avionics. The J-15 (2009+) is the carrier-based variant for PLA Navy carriers, and the J-16 (2017+) is the two-seat strike derivative. Russia has alleged unauthorised technology transfer during this evolution, as the Chinese J-11B and J-11D diverged sharply from the Russian Su-27 baseline. Of the 280-plus J-11-family airframes produced, more than 200 J-11B and J-11D fighters remain in active PLAAF service.

For Kids — a shorter, friendlier version

The Shenyang J-11 is China's copy of the Russian Sukhoi Su-27 Flanker. Russia first sold Su-27 fighter jets to China in the 1990s. Then in 1996, China bought the right to build them in Chinese factories. Today the J-11 is one of China's main fighter jets, with over 400 in service.

The J-11 has two engines, two AL-31F turbofans giving over 60,000 pounds of thrust together. Top speed is Mach 2.35, faster than a rifle bullet. The plane carries a 30 mm cannon plus air-to-air missiles under the wings. The wingspan is 48 feet wide, about the length of a school bus.

Later versions are very different from the Russian original. The J-11B uses Chinese WS-10 engines, Chinese radar, and Chinese-made missiles. The J-11BS adds a second seat for training. China keeps making more J-11s every year.

About 400 J-11s now serve in the People's Liberation Army Air Force and Navy. China has not exported any J-11s, partly because Russia would be upset about competing with its own Su-27s. The J-11 is China's main heavy fighter, with the smaller J-10 handling lighter missions.

Fun Facts

  • The J-11 is a copy of the Russian Su-27 fighter, built in Chinese factories.
  • Top speed is Mach 2.35, faster than a rifle bullet.
  • The wingspan is 48 feet wide, longer than a school bus.
  • Over 400 J-11s now serve in the Chinese Air Force and Navy.
  • Newer J-11B versions use Chinese engines and Chinese radar instead of Russian parts.
  • China bought the right to build J-11s from Russia in 1996 for $2.5 billion.
  • Russia is unhappy that China builds its own Su-27 copies without buying Russian parts.

Kids’ Questions

Why copy a Russian plane?

In the 1990s, China had no modern fighter jet design of its own. Russia was willing to sell its Su-27, one of the best fighters in the world at the time. China bought the right to build Su-27s in Chinese factories. That gave China a top fighter jet right away while it worked on home-built designs like the J-10.

Is it the same as a Russian Su-27?

Early J-11s were almost the same as the Russian Su-27. Newer J-11B and J-11BS versions have Chinese engines, Chinese radar, and Chinese-made missiles. They look the same on the outside but are very different inside. China can now keep building and improving J-11s without buying any Russian parts.

How is it different from a J-10?

The J-10 is a single-engine fighter with one big delta wing and small canard wings up front. The J-11 is bigger, with two engines and a Russian-style swept wing. The J-11 carries more weapons and flies farther, but the J-10 is cheaper and easier to fix. Both are important parts of the Chinese Air Force.

Variants

J-11A (initial licensed 1998-2007)
Licensed Russian Su-27SK production, around 95 delivered to the PLAAF. Backbone of the early J-11 fleet.
J-11B (Chinese-indigenised 2007+)
Indigenous Chinese variant with WS-10 engines and Chinese-developed mission systems. Around 140 delivered. Backbone of the current PLAAF J-11 fleet.
J-11BS (two-seat trainer)
Two-seat trainer derivative of the J-11B. Limited production.
J-11D (upgraded 2015+)
Updated variant with AESA radar and new mission systems. Around 30 delivered, currently the principal upgraded J-11.
J-15 (carrier-based)
Carrier-based variant for PLA Navy carriers (Liaoning, Shandong, Fujian), modified from the J-11. Separate J-15 entry.
J-16 (two-seat strike)
Two-seat strike derivative based on the J-11. Separate J-16 entry.

Notable Operators

People's Liberation Army Air Force (PLAAF)
Primary operator. More than 200 J-11A, J-11B and J-11D airframes serve across multiple regiments in the air-superiority and multirole roles.
Foreign / export
None — the J-11 is exclusively Chinese-operated. Russian objections and Chinese export-policy considerations have limited foreign export prospects.
Future / planned
PLAAF plans continued J-11D upgrades, with production at the SAC Shenyang facility ongoing at a modest rate. The family is expected to remain in PLAAF service through 2040 alongside the J-20 and J-35 fifth-generation platforms.

Frequently Asked Questions

How does J-11 differ from Su-27?

The J-11 is the indigenised line. The Sukhoi Su-27 Flanker is the Russian original; the J-11A (1998–2007) was licensed Su-27SK production, while the J-11B and J-11D are Chinese-indigenised marks with WS-10 engines, Chinese-developed AESA radar, PL-12 and PL-15 missiles, and updated mission systems. The J-11D contains roughly 70 percent indigenous Chinese content, against around 30 percent on the original J-11A. Russia has alleged unauthorised technology transfer during indigenisation, while Beijing has consistently maintained that the J-11B and J-11D modifications are independent Chinese development.

What is WS-10 'Taihang' engine?

The WS-10 is a Chinese-developed afterburning turbofan rated at 21,500–22,500 lbf in afterburner. It was conceived as a Chinese alternative to the Russian AL-31F used on the early J-11A. WS-10 production began in 2007, with first frontline use on the J-11B; subsequent WS-10A, WS-10B and WS-10C marks have raised performance. The engine represents China's push to break Russian engine dependence and now powers the J-10C, J-11B, J-11D, J-15, J-16 and J-20 in several forms. Reliability and thrust have historically trailed the AL-31F and Western equivalents, though recent marks have closed the gap.

How does J-11 compare to F-15?

Both are heavy twin-engine air-superiority fighters. The F-15C Eagle is the U.S. design, fielding AN/APG-63, AN/APG-70 and AN/APG-82 radars and the AIM-120 AMRAAM. The J-11D pairs a Chinese AESA radar with the long-range PL-15 air-to-air missile. Performance class is broadly similar, and the J-11D/PL-15 combination is credible against Western fighters in air-to-air engagements. The two are broadly comparable in service, though the J-11D has not seen combat in major engagements, in contrast to the F-15's extensive combat record.

Will J-11 be replaced?

Not directly. China's fifth-generation J-20 and future J-35 complement rather than replace the existing fourth-generation fleet. The PLAAF plans continued J-11D upgrades, with the family staying in active service through 2040 alongside the J-20 and J-35. As fifth-generation production scales, J-11 airframes will progressively shift to reserve and training roles, giving the family a service life of more than 50 years from its 1998 entry through retirement after 2040.

What is China's response to Russian technology-transfer claims?

Beijing has consistently denied any unauthorised technology transfer during J-11 indigenisation, arguing that (1) the J-11A was licensed production under the 1996 Sino-Russian agreement; (2) the J-11B and J-11D modifications stem from independent Chinese R&D; and (3) Russian objections reflect commercial competition rather than legal violation. Russia has not pursued formal legal action, likely reflecting both diplomatic considerations and the practical limits of intellectual-property claims in international courts. The dispute has strained Russia-China defence cooperation but has not derailed continued cooperation on the Su-30MKK, Su-35 procurement, the S-400 missile system and other programmes.

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