China continues testing the J-36, its sixth-generation stealth fighter. Its new configurations reveal Beijing’s technological choices.
Summary
China is accelerating tests of the Chengdu J-36, a sixth-generation combat aircraft prototype whose first images appeared in December 2024. Recognized by its tailless architecture and three engines, the aircraft is evolving rapidly. Several prototypes observed in 2025 and 2026 feature significant modifications to the air intakes, nozzles, and landing gear. These changes reflect a search for a balance between stealth, maneuverability, and range. With an estimated length of about 23 meters and a wingspan potentially exceeding 20 meters, the J-36 appears designed for missions going beyond traditional air combat. Specifically, its configuration could allow it to carry out long-range strikes and coordinate combat drones. Facing the American Boeing F-47 and the European GCAP program, Beijing is testing an ambitious approach, but one whose operational performance remains largely unknown.
The J-36 multiplies tests with multiple configurations
The development of the Chengdu J-36 is progressing at a steady pace. Since its appearance over Chengdu on December 26, 2024, several versions of this Chinese stealth fighter have been observed in flight. Images published in September 2026 show an aircraft whose configuration has noticeably evolved.
Developed by Chengdu Aircraft Corporation, a subsidiary of Aviation Industry Corporation of China (AVIC), the J-36 constitutes one of Beijing’s most ambitious military aviation programs. Its designation remains unofficial, derived from the number 36011 spotted on the first prototype.
In October 2025, a second aircraft already revealed significant transformations. Other examples appeared in 2026. According to analyses by The War Zone and the South China Morning Post, four to five prototypes may now be participating in tests. Their exact number is not confirmed.
On June 28, 2026, a video broadcast by an official People’s Liberation Army account also briefly showed an aircraft identified as the J-36.
This proliferation of prototypes indicates that Chengdu is evaluating various technical solutions before freezing the final configuration. It does not mean the aircraft is close to entering service.
The three-engine configuration constitutes a technological breakthrough
Unlike modern fighter jets, which are generally equipped with one or two turbojets, the J-36 adopts a three-engine architecture.
Two engines are powered by lateral air intakes, while a third uses a dorsal air intake located on the upper part of the fuselage.
This layout offers several potential advantages.
The combined thrust could allow a particularly heavy aircraft to reach supersonic speeds while carrying a significant amount of fuel and weaponry in its internal bays. Three engines would also offer an increased electrical generation capacity to power radars, electronic systems, and computers.
This power could become decisive for future electronic warfare equipment and directed-energy weapons.
In September 2026, AVIC presented an airborne laser system concept weighing less than 380 kilograms. Some illustrations mentioned the J-36, without demonstrating that such a device was actually installed.
The trade-off between power, fuel consumption, and stealth
This configuration nevertheless involves constraints.
Three engines increase mechanical complexity, maintenance needs, and heat sources. They also require a significant volume for intake ducts, fuel lines, and cooling systems.
The tri-engine setup therefore does not automatically improve range. Range depends on engine efficiency, drag, and the amount of fuel carried.
Public estimates place the length of the J-36 around 22.5 to 23 meters, with a wingspan approximately between 19 and 25 meters. Its maximum takeoff weight could reach several tens of tons. None of these figures have been officially confirmed.
Successive prototypes reveal an evolving architecture
The term evolving configuration does not designate here an aircraft whose geometry changes during flight. It describes a development process in which several prototypes experiment with different aerodynamic solutions.
New air intakes improve the aerodynamic trade-off
The first J-36 possessed two trapezoidal lateral air intakes, comparable in principle to those of the F-22 Raptor.
Subsequent prototypes feature redesigned air intakes, apparently utilizing Diverterless Supersonic Inlet (DSI) technology.
A DSI intake uses a contoured hump to manage supersonic flows and divert the boundary layer—that slowed air in contact with the fuselage that would disrupt compressor operation.
This solution can reduce the number of parts, weight, and certain surface discontinuities unfavorable to stealth.
Curved intake ducts can also mask the initial compressor blades, which are particularly reflective to radar waves.
Vectoring nozzles enhance control without empennage
The most spectacular evolution concerns the engine exhausts.
On the first prototype, the three exhausts were deeply embedded in the fuselage. This arrangement could limit their exposure to radars and contribute to thermal masking.
The following versions feature two-dimensional thrust-vectoring rectangular nozzles, similar in principle to those of the F-22.
By vertically orienting the exhaust gases, these devices produce additional pitch moment. They potentially improve aircraft control at low speeds and high angles of attack.
This capability is particularly interesting for an aircraft lacking vertical stabilizers and horizontal empennage.
In July 2026, some images attributed to a new prototype nevertheless seemed to show a return to more deeply embedded exhausts. Chengdu could thus be comparing multiple trade-offs rather than following a strictly linear evolution.
The removal of empennages responds to stealth requirements
The J-36 uses a modified delta wing without a vertical empennage, whose large moving surfaces ensure several control functions.
On a conventional fighter, the vertical stabilizers stabilize the aircraft in yaw, while the horizontal empennage controls pitch.
The J-36 must distribute these functions among its trailing-edge control surfaces, potentially differential surfaces, and thrust vectoring.
Digital flight control systems continuously coordinate these devices to maintain the stability and trajectory requested by the pilot.
The absence of stabilizers reduces surfaces likely to reflect radar waves. It also promotes a continuous silhouette, with edges oriented along common directions.
However, this architecture complicates directional control and imposes particularly sophisticated flight control laws.
Actual stealth will also depend on radar-absorbent materials, panel junctions, bays, and electronic emissions. The exterior shape alone does not establish the radar signature of the J-36.
The J-36 could become a long-range combat aircraft
The prototype’s dimensions, side-by-side two-seat cockpit, and large internal bays suggest a vocation different from that of a light fighter.
The J-36 could combine long-range interception, stealth penetration, precision attack, and drone coordination.
In the Western Pacific, this formula would present particular interest against tanker aircraft, airborne surveillance aircraft, and opposing command platforms.
Its large internal volume could accommodate long-range air-to-air missiles without compromising stealth through external loads.
The second crew member could supervise sensors and accompanying drones. However, this task distribution remains hypothetical.
China is simultaneously developing another tailless aircraft, generally designated J-XDS, at Shenyang. Its twin-engine configuration suggests that Beijing is exploring multiple categories of sixth-generation fighters rather than a single model.
The J-36 versus the American F-47 and European programs
The primary strategic competitor of the J-36 is the Boeing F-47, selected by the U.S. Air Force in March 2025 under the Next Generation Air Dominance program.
The United States announces an action radius exceeding 1,852 kilometers (1,000 nautical miles) and a maximum speed exceeding Mach 2 for this aircraft. Its first flight is expected in 2028.
No equivalent official data exists for the J-36. A direct comparison of their performances would therefore be premature.
The F-47 favors an integrated architecture combining a piloted aircraft, collaborative drones, and sensor networks. The J-36 appears to pursue a comparable logic, with a potential emphasis on payload capacity and long-distance missions.
In Europe, the Global Combat Air Programme (GCAP), associating the United Kingdom, Italy, and Japan, aims for entry into service in 2035. A 4.6 billion pound sterling development contract was signed in July 2026.
The situation is different for the Franco-German FCAS. Joint development of its fighter was abandoned in June 2026 after industrial disagreements between Dassault Aviation and Airbus. France is now preparing a national aircraft, the Future Combat Air System, targeting the 2040 horizon.
These programs share several objectives: radar discretion, increased autonomy, distributed sensors, and human-machine cooperation. Their configurations and maturity nevertheless remain very different.
Tests will still have to demonstrate operational superiority
The J-36 represents a major advancement for the Chinese aeronautical industry. Its three-engine architecture, integrated control surfaces, and successive prototypes demonstrate a rapid experimentation capability.
However, a flying prototype is not an operational aircraft.
The reliability of its engines, fuel consumption, radar signature, sensor performance, and capacity to integrate drones remain unknown. Its action radius, ceiling, and military load have not been published.
The experience gained with the Chengdu J-20 nevertheless gives China a solid industrial foundation to pursue this development.
The real question is no longer whether Beijing can fly a sixth-generation fighter. It is to determine how quickly Chengdu can transform this experimental platform into a reliable, industrially reproducible combat system capable of operating in a heavily contested aerial environment.