Modern Day

Is the Shenyang J-11 just a Copy/Paste Su-27?

Originating from the Soviet-designed Sukhoi Su-27, the Shenyang J-11 is a twin-engine jet fighter that has undergone extensive modifications and improvements, transitioning into a cornerstone of the People’s Liberation Army Air Force (PLAAF). Its development reflects China’s strategic shift towards modernizing its air force and enhancing its aerial combat proficiency.


Historical Background and Development

The journey of the Shenyang J-11 began in the early 1990s. This period saw China embarking on a strategic endeavour to modernise its air force, a move underscored by the acquisition of the Su-27 from Russia. The import of this advanced fighter jet served a dual purpose: it immediately boosted the PLAAF’s combat capabilities and laid the groundwork for an ambitious programme of indigenous fighter development.

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The decision to procure the Su-27 was not merely a purchase but a strategic investment in China’s future aerial combat capabilities.

Recognising the technological excellence and combat prowess of the Su-27, the Shenyang Aircraft Corporation, under the auspices of the Chinese government, initiated a project to produce a domestic variant that could meet the specific operational needs of the PLAAF. This initiative represented a significant step towards self-reliance in military technology, signalling China’s intention to reduce its dependency on foreign military imports.

A J-11B in a stunning paint scheme. Photo credit - CC BY 4.0.
A J-11B in a stunning paint scheme. Photo credit – CC BY 4.0.

The collaboration between China and Russia in the early stages of the J-11 programme facilitated a transfer of technology that was instrumental in the development of the fighter jet.

Chinese engineers and designers worked meticulously to assimilate and adapt the Su-27’s design and technology, aiming to replicate its superior performance characteristics while incorporating modifications to enhance its operational effectiveness in the context of China’s strategic requirements.

The adaptation process involved extensive reverse engineering and innovation, as the Shenyang Aircraft Corporation sought to overcome the challenges associated with replicating such an advanced fighter jet.

The endeavour was far from straightforward, requiring a deep understanding of the Su-27’s complex aerodynamic design, sophisticated avionics, and powerful propulsion systems. Through relentless effort and ingenuity, the Chinese team gradually mastered the intricacies of the Su-27’s design, paving the way for the birth of the J-11.

As the J-11 took shape, it became clear that this was not merely a clone of the Su-27 but a new breed of fighter jet tailored to the demands of modern warfare. The project exemplified China’s growing capabilities in aerospace engineering and its determination to forge an independent path in military technology development.

The successful development of the J-11 marked a milestone in China’s military aviation history, symbolising the nation’s emergence as a significant player in the realm of advanced fighter aircraft.

Aside from the markings, the Su-27 and J-11 are almost impossible to distinguish even to a keen aviation enthusiast. Photo credit - Dmitriy Pichugin GFDL 1.2.
Aside from the markings, the Su-27 and J-11 are almost impossible to distinguish even to a keen aviation enthusiast. Photo credit – Dmitriy Pichugin GFDL 1.2.

Not Quite Copy/Paste

The pair share a profound connection that extends beyond their visual resemblance, rooted deeply in their design, performance characteristics, and operational capabilities.

This connection stems from the original agreement between China and Russia, which allowed the Shenyang Aircraft Corporation to manufacture the Su-27 under license, thereby laying the groundwork for the development of the J-11.

At the core of their similarity lies the aerodynamic design, which the J-11 inherits almost directly from the Su-27. Both aircraft boast a large, powerful airframe equipped with a blended wing body design that enhances their manoeuvrability and agility at various speeds and altitudes.

This design enables them to perform complex air combat manoeuvres, making them formidable opponents in dogfights.

The AL-31 is hugely powerful and the Su-27 family of aircraft use two of them! Photo credit - Vitaly Kuzmin CC BY-SA 4.0.
The AL-31 is hugely powerful and the Su-27 family of aircraft use two of them! However, the later models of J-11 moved away from the Russian design. Photo credit – Vitaly Kuzmin CC BY-SA 4.0.

The propulsion systems of the J-11 and the Su-27 further illustrate their kinship. Each aircraft is powered by two turbofan engines, providing the thrust required for supersonic flight and allowing for quick acceleration and high top speeds.

This power not only contributes to their combat effectiveness but also extends their operational range and payload capacity, enabling them to carry a diverse array of weaponry for multiple mission profiles.

Initially, the avionics and radar systems represent another area of significant overlap between the J-11 and Su-27. Initially, the J-11 relied on technology and systems closely mirroring those of the Su-27, including its radar capabilities for air-to-air and air-to-ground engagements.

Over time, while the J-11 has seen upgrades to its avionics suite to incorporate more advanced Chinese-developed systems, the foundational technologies bear a strong resemblance to the Russian design, emphasizing long-range engagement and situational awareness.

The weapons systems of both fighters further underscore their similarities. Each is capable of being armed with a similar range of air-to-air missiles, air-to-ground missiles, and other ordnance.

This versatility in armament makes them both highly effective in a variety of combat roles, from achieving air superiority to conducting precision strikes against ground targets.

Whether it be Su-27 or J-11, both aircraft can carry a deadly array of weapons.
Whether it be Su-27 or J-11, both aircraft can carry a deadly array of weapons.

The operational roles and capabilities of the J-11 and Su-27 also mirror each other closely. Designed primarily for air superiority missions, both aircraft are equally adept at performing secondary roles such as ground attack, reconnaissance, and maritime strike missions.

This multirole capability ensures they can be deployed effectively across a broad spectrum of military operations, reflecting a strategic approach to aerial warfare that prioritises flexibility and adaptability.

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So What Are the Differences?

Despite their shared lineage and numerous similarities, diverge significantly in several key areas, reflecting the evolution of the J-11 to meet the specific needs and strategic ambitions of the People’s Liberation Army Air Force (PLAAF).

These differences span across technological advancements, operational enhancements, and strategic implications, marking the J-11’s transition from a derivative to a distinct platform in its own right.

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One of the most pronounced differences lies in the realm of avionics and electronics in the later J-11s. While the J-11 originated with systems closely mirroring those of the Su-27, Chinese engineers have progressively integrated more sophisticated, domestically developed avionics into the J-11.

This includes advanced radar systems capable of detecting and engaging multiple targets at greater distances, improved electronic warfare suites for enhanced survivability in contested environments, and modern communication systems for better interoperability within the PLAAF.

These enhancements not only augment the J-11’s combat effectiveness but also reflect China’s broader strategy of achieving technological parity with, or superiority over, potential adversaries.

The newer models diverge significantly from the Su-27 family.
The newer models diverge significantly from the Su-27 family.

Another significant area of divergence is the incorporation of indigenous weapons systems. The J-11 has been adapted to carry a wide array of Chinese-manufactured missiles and bombs, some of which offer capabilities beyond those of the weapons originally integrated with the Su-27.

This includes newer air-to-air missiles with longer engagement ranges and more sophisticated guidance systems, as well as precision-guided munitions for ground attack roles. The ability to equip the J-11 with these advanced weapons systems enhances its flexibility and lethality across a spectrum of mission profiles.

Furthermore, the J-11 has seen adaptations in its engine technology. While early versions of the J-11 relied on Russian engines, there has been a concerted effort to develop and deploy indigenous engines in later variants.

These engines aim to match or exceed the performance characteristics of their Russian counterparts, with a focus on improving reliability, maintainability, and fuel efficiency. The pursuit of self-reliance in propulsion technology signifies a critical step towards complete operational independence from foreign suppliers.

The development path of the J-11 also highlights differences in terms of stealth and low-observable technologies. Newer variants of the J-11, such as the J-11D, have incorporated features designed to reduce radar cross-section and enhance survivability against modern air defence systems.

These efforts include modifications to the airframe, the use of radar-absorbent materials, and changes to the aircraft’s external profile. Such advancements underscore the PLAAF’s recognition of stealth as a key factor in contemporary aerial warfare, diverging from the Su-27’s original design philosophy, which prioritised manoeuvrability and speed over low observability.

The twinseat J-11BS is used as a trainer.
The twin-seat J-11BS is used as a trainer.

Operational Role

At the heart of the J-11’s operational role lies its primary mission: to achieve and maintain air superiority. The fighter excels in engaging adversary aircraft, leveraging its advanced avionics, radar systems, and a wide array of air-to-air missiles to detect, track, and neutralize threats over considerable distances.

This capability ensures the PLAAF can secure the skies, a prerequisite for conducting operations without the looming threat of enemy air interference. The J-11’s agility, speed, and sophisticated weapon systems make it a formidable opponent in dogfights, allowing it to outmanoeuvre and outgun competing fighters.

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Beyond air-to-air combat, the J-11 extends its prowess to ground attack missions, underscoring its role as a multi-role fighter. Equipped with precision-guided munitions, including laser-guided bombs and air-to-surface missiles, the aircraft can deliver devastating strikes against enemy fortifications, troop concentrations, and other high-value targets.

This versatility ensures the PLAAF can achieve a synergistic effect on the battlefield, where air superiority dovetails with the capacity to conduct surgical strikes, disrupting enemy operations and providing close air support to ground forces.

The Chinese Navy also use the J-11 with folding wings, much like the Su-33. Photo credit - N509FZ.
Four J-11s flying with a KJ-500. Photo credit – N509FZ.

The reconnaissance capabilities of the J-11 further augment its operational utility. Fitted with high-resolution cameras and electronic intelligence-gathering equipment, the aircraft can perform deep penetration surveillance missions, collecting critical data on enemy movements, installations, and air defence systems.

This intelligence not only informs strategic decision-making but also facilitates the planning and execution of precision strikes, enhancing the overall effectiveness of the PLAAF’s combat operations.

Maritime strike missions represent another facet of the J-11’s operational capabilities. With the ability to carry anti-ship missiles, the fighter plays a key role in asserting China’s maritime claims and protecting its interests in contested waters.

The J-11’s reach and firepower enable the PLAAF to project power far beyond China’s shores, deterring potential adversaries and providing a credible threat to surface vessels, including aircraft carriers and other capital ships.

The Chinese Navy also use the J-15 with folding wings, much like the Su-33.
The Chinese Navy also use the J-15 with folding wings, much like the Su-33.

The J-11’s adaptability to a wide range of mission profiles underscores the PLAAF’s strategic emphasis on flexibility and preparedness for multi-domain operations. By integrating the J-11 into its aerial arsenal, China has not only bolstered its defensive capabilities but also enhanced its ability to conduct offensive operations across land, air, and sea.

This multirole flexibility, combined with the aircraft’s advanced technology and substantial combat radius, positions the J-11 as a linchpin in China’s strategy to maintain regional dominance and influence the global balance of power.


Since its inception, the airframe has undergone a series of evolutions, branching out into several variants that cater to the diverse and expanding operational requirements of the People’s Liberation Army Air Force (PLAAF). Each variant of the J-11 represents a step forward in China’s quest for aerial superiority, reflecting incremental improvements in technology, performance, and strategic capabilities.

This progression not only underscores the adaptability of the J-11 platform but also highlights China’s commitment to achieving self-reliance and innovation in its military aviation sector.

The J-11B variant marks a significant milestone in the evolution of the J-11 series. Developed as an enhanced version of the original J-11, which was closely based on the Sukhoi Su-27, the J-11B incorporates a high degree of indigenous technology, signalling a move towards greater autonomy from Russian designs.

The aircraft features improved avionics, including a Chinese-developed radar system and electronic warfare suite, enhancing its combat effectiveness and situational awareness. Additionally, the J-11B is equipped with a new engine, designed and manufactured in China, offering improved performance and reliability.

This variant exemplifies the PLAAF’s shift towards equipping its fleet with domestically produced hardware, reducing dependence on foreign technology and fostering the growth of China’s aerospace industry.

A J-11BS at Lhasa airport.
A J-11BS at Lhasa airport.

Following the J-11B, the J-11BS variant emerged as a two-seat trainer and combat aircraft, extending the operational flexibility of the J-11 platform. The J-11BS serves dual purposes: it provides advanced training for PLAAF pilots, preparing them for operations in the single-seat J-11B, and it fulfils combat roles, particularly in missions that benefit from the presence of a second crew member.

This variant underscores the importance of versatility and adaptability in modern air combat, where the ability to perform multiple roles can significantly enhance the operational capabilities of an air force.

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The J-11D variant represents the pinnacle of the J-11 series’ evolution, incorporating the latest advancements in stealth technology, avionics, and weapon systems. This variant introduces stealth features designed to reduce radar cross-section, enhancing survivability in contested airspace.

The J-11D also benefits from an upgraded avionics suite, featuring a more advanced radar system capable of engaging multiple targets simultaneously and at greater distances. Additionally, the aircraft is compatible with next-generation air-to-air and air-to-ground missiles, increasing its lethality and operational effectiveness.