China’s prototype high-power rotary engine, which represents a major breakthrough in the technology, has just completed its first ignition sequence, a move that will usher it into mass production in 2027. Developed by a subsidiary called Harbin Dongan Auto Engine, owned by Changan Automobile Group, is called R05E and designed for low-altitude vehicles, which China’s government lists as a strategic priority.
Unveiled on April 9, as part of the collaboration between Peugeot and AVL, a worldwide mobility technology leader in development, simulation, and testing, comes the R05E, marking an amalgamation of mechanistic innovation and specific application. At the heart of this innovation is the single rotor system with the curved edge triangular piston, thereby optimizing the charges for efficient burn. It also has an independent circuit dual ignition system for effortless startups and optimized fuel consumption at different times of usage. This is further aided by the low-weight eccentric shaft and balancing system for reduced inertia and efficient cooling with the water jacket.
Factors like performance metrics have put the R05E motor in the competitive group through its rated speed of 6,500 rpm and output power of 53 kW, emphasizing ultra-high power density. Noise, Vibration, and Harmonic performance is also optimized considering the needs of comfortable and safe manned low-altitude craft. Weight is reduced through aluminum material used in the casting of the casing. Friction losses are also reduced using an NDC anti-friction material called nanodiamond composite.
The flexibility of their engines is not only reflected in their applications on aircraft that carry people. Dongan is also developing both naturally aspirated and turbocharged rotary engines for medium to high altitude UAVs together with partners such as ARIDGE (previously Xpeng Aeroht), Huawei, and DJI. This is part of China’s efforts to integrate unmanned systems with a low-altitude economy that is forecasted to grow to 1.5 trillion yuan by 2025 and 3.5 trillion yuan by 2035.
“The so-called low-altitude economy, which operates below 1,000 meters, is to be transformed in Chinese development planning from experimental aviation to an essential part of urban infrastructure,” according to plans laid out in “The Action Plan for the Development of Smart Cities and Global Digital Transformation” back in October of 2025. “Cities such as Shenzhen have rolled out massive 5G-enabled Low Altitude Communication systems that have enabled 780,000 commercial cargo drone flights since 2023,” not only managing data in maritime traffic and weather observation but also “designed to interact in real-time” to improve predictability and safety for systems such as R05E.
In this regard, rotary engines possess several critical advantages. Because they are small in size, lighter in weight, and have greater power-to-weight ratios, they are perfect examples of eVTOL aircraft, UCAVs, or hybrid engines. As compared to piston engines, rotary engines are smooth in operation with fewer components, implying that they would require longer periods of time between overhauls, which would be effective in commercial flight patterns. In addition, the safety compliance in manned low-altitude air transport has been improved by the dual ignition system of the R05E engine.
China’s infrastructure-led development strategy is equally an incubator for propulsion innovation. China integrates low-altitude operating missions as a component of a broader unified management approach for cities, thereby ensuring the R05E propulsion system is developed and operated in a larger environment of harmonized airspace management, emergency integration, and environment observation, as opposed to Western concepts dominantly engaged in the area of certification only, largely trusting the forces of the market place for the rest. For UAV makers, the R05E drone specifications present opportunities for increased payload carrying capacity and a greater operational range, especially in applications involving rescue missions, aerial inspections, and transporting precious goods.
Rotary engines provide reliable power even with a fluctuating altitude and temperature, making them fit well into a geographically diverse operating landscape, especially for a country like China that deals with logging and industrial belts. The ignition milestone for the R05E signifies more than an engineering feat for the masses but indicates the dawn of their era of propulsion technology that aligns with the burgeoning low-altitude economy. Given that mass production has been aptly planned for 2027, this propulsion technology represents the convergence of innovative engineering solutions and China’s overall economic vision for the future in the aerial mobility landscape.