China has developed a contra-rotary ramjet engine that enables seamless flight from standstill to hypersonic speeds.
China has unveiled a new type of air-breathing engine that could replace today’s turbine-ramjet systems, and reshape how future fighter jets and missiles achieve hypersonic speeds. The so-called contra-rotary ramjet engine was developed by researchers from the Chinese Academy of Sciences .
The project was led by Xu Jianzhong, PhD, a CAS academician and engineering thermophysics expert. Designed to run continuously from a stationary start to above Mach 6, the engine aims to eliminate the need for multiple propulsion systems, which represents one of the biggest challenges in high-speed flight. As per the team, the prototype has been completed and experimentally verified after over three decades of work. While still in development, it could significantly upgrade military and aerospace capabilities. The researchers’ next steps include adapting it for different aircraft and conducting real-world flight tests.“China’s development of new-principle engines would be a strategic choice to break the Western monopoly and even surpass the West,” Jianzhong told China Science Daily earlier in March 2026. A new propulsion approachConventional hypersonic propulsion relies on two different propulsion systems: a turbine engine that handles speeds up to Mach 3, and a ramjet for higher speeds. However, this dual-system concept is complex, heavy, and has operational risks.This instability is highest during mode transitions, where airflow and combustion conditions can destabilize the system, especially during climbing or maneuvering flight. To tackle this issue, the new design boasts two sets of compressor blades rotating in opposite directions.According to South China Morning Post , the contra-rotary ramjet is built to function across the entire flight envelope, from takeoff to hypersonic speeds, without switching propulsion modes. By integrating turbine and ramjet technologies, a concept dating back to the end of World War II, the scientists removed the inactive deadweight and simplified the model. Jianzhong stated the contra-rotary compressor is the main innovation behind the system’s architecture. Because the high- and low-pressure rotors spin in opposite ways, the engine maintains relative speed and reduces absolute rotational speed, thus lowering centrifugal forces on blades and discs. Simpler flight designThe concept overturns the idea that shock waves must be reduced. Instead, they are harnessed for compression. This eliminates the need for guide vanes between the high- and low-pressure stages, and results in a more compact structure.China Science Daily highlighted the innovative approach. “The booster capacity of the two-stage vanes is equivalent to that of the traditional four to six-stage ones, and both the weight and size are significantly reduced,” it stated. The contra-rotary ram-compressor concept was outlined around 2000. The team spent years overcoming technical barriers, particularly in blade cascade design and experimental validation. By 2009, it had gained institutional support.This is the first time ever the engine has been demonstrated in a functional unit. If adapted for real-world use, it could slash engine weight in hypersonic missiles, in addition to potentially increasing range, payload capacity, and maneuverability.SCMP reported the development comes amid intensifying global competition in hypersonic technologies. In the US, firms like GE Aerospace and Lockheed Martin are testing rotating detonation ramjets that focus on combustion efficiency rather than airflow compression.
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