A new aviation rotary-piston engine has been introduced by Russia, which has the potential to serve as a major replacement for imported powerplants used in unmanned aerial vehicles and light aircraft. The Central Institute of Aviation Motors, named after P.I. Baranov (CIAM), a division of the National Research Center “Institute named after N.E. Zhukovsky,” has developed the 150-hp-class engine, designated the RPD-150T, as part of a development program commissioned by the Ministry of Industry and Trade of Russia.
The engine is being developed primarily as an import-substitution solution for foreign piston engines, with a particular emphasis on the Rotax 912, 914, and 915 families, which are in widespread use. The development of a domestic alternative is strategically significant for Russia, as these engines occupy an important segment of the global light-aircraft and UAV market.
The RPD-150T is a two-section rotary-piston engine that is equipped with turbocharging and a block-modular architecture. Although some descriptions position its output in the 150–165 hp range, its nominal power is 150 hp. Its relatively low mass is one of its most notable attributes. The engine, in conjunction with its associated systems, is reported to weigh approximately 87 kg. Its declared service life has established it in a competitive position within its power class.
Designed as Part of a Larger Engine Family
The RPD-150T is not being developed as an isolated project. It forms part of a broader CIAM family of rotary-piston aviation engines covering a power range of approximately 50 to 500 hp.
This modular approach has the potential to enable Russia to establish a shared technological foundation for a variety of aircraft categories. Smaller engines could target lightweight UAVs, while larger versions could be adapted for heavier unmanned platforms and light aviation.
To satisfy the rigorous demands of aviation propulsion, the RPD-150T integrates numerous technologies. A full-authority FADEC system enables automated control of the engine and its operating parameters, thereby providing digital engine management. The engine also uses a dry-sump lubrication system, and critical systems are duplicated to improve reliability.
The use of sophisticated composite materials, such as metal-ceramic matrix materials and intermetallic coatings, and high-temperature, wear-resistant coatings is another critical aspect. Such technologies are particularly relevant to rotary engines because their operating temperatures and sealing requirements place considerable demands on materials.
First Public Appearance in 2026
The RPD-150T was publicly shown for the first time in 2026, appearing at the NAIS-2026 and INNOPROM-2026 exhibitions. The design documentation necessary for production had been finalized by CIAM by 2026.
However, public presentation does not yet mean that the engine has entered full-scale serial production. There was no confirmed information as of September 11, 2026, that mass production of the RPD-150T had commenced.
According to reports, the Russian Ministry of Industry and Trade has suggested that serial production rights could be transferred to other industrial enterprises through licensing agreements. This has the potential to enable numerous Russian manufacturers to participate in production if the engine successfully navigates the certification and industrialization processes.
Plakart, a Russian company, has also been involved in the application of nanostructured coatings to engine components. In the interim, the Agat Gavrilov-Yamsky Machine-Building Plant, which is already associated with the production of Russian APD-110 and APD-120 piston aviation engines, is mentioned in connection with possible manufacturing capabilities.
Why Rotary Engines Matter for UAVs
The RPD-150T enters a market in which rotary engines have already established a significant international presence. Rotary propulsion systems for aviation and unmanned applications have been developed by a variety of companies, including British UAV Engines, Rotron Power, Advanced Innovative Engineering, Austrian Austro Engine, Swiss Mistral Engines, American LiquidPiston and Freedom Motors, German Sky Power, and Italian Zanzottera.
The technology is appealing due to its high power in relation to its size and weight.
In contrast to traditional piston engines, a rotary engine does not depend on the repeated movement of multiple pistons within cylinders. The orbital movement of a rotor generates power through the rotary mechanism, which enables a compact engine architecture with a relatively low number of main moving components.
This can be especially beneficial for designers of unmanned aerial vehicles (UAVs). The layout of an aircraft can be more flexible with a smaller powerplant, and onboard sensors, cameras, navigation equipment, and other sensitive electronics can benefit from reduced vibration.
The technology has already been operationally demonstrated. For instance, the RQ-7 Shadow and Elbit Hermes 450 are unmanned platforms that have been propelled by rotary engines from UAV Engines. Rotary propulsion is not just an experimental concept; it is a well-established technology for specific aviation applications, as evidenced by these applications.
The Resource Question
One of the traditional concerns surrounding rotary engines has been durability. Earlier generations were often associated with a relatively short operating life and rigorous maintenance requirements.
Nevertheless, there has been substantial progress in the development of rotary engines for modern aviation. Rotron Power has developed two-rotor engines with outputs approaching 100 hp and has promoted improvements in time between overhauls, while British UAV Engines produces a family of engines that covers approximately 38 to 75 hp.
The RPD-150T is being introduced with an ambitious resource target. Other Russian descriptions report a potential full service life of up to 5,000 hours, with a 1,000-hour interval between overhauls, while publicly stated figures indicate a 3,000-hour resource.
The RPD-150T could provide a significant advantage over traditional perceptions of rotary engines as short-lived or maintenance-intensive powerplants if these figures are attained in operational service.
Fuel Consumption Remains the Key Challenge
The RPD-150T’s capacity to generate 150 horsepower is not the main concern. The question is whether it can economically deliver the necessary power to compete with highly developed conventional piston engines.
Historically, rotary engines have faced higher fuel consumption than their most capable piston-engine competitors. A specific fuel consumption of approximately 217 g/hp·h is reported for the RPD-150T.
For the purpose of comparison, the Rotax 915 iS is frequently referenced in the approximate range of 280–310 g/kWh, which translates to approximately 206–228 g/hp·h. On those figures, the difference is much smaller than the traditional reputation of rotary engines might suggest.
That does not necessarily make the RPD-150T more fuel-efficient than the Rotax. Rather, it suggests that contemporary rotary technology has the potential to approach the efficacy of traditional piston engines while maintaining its advantages in power density, vibration, and packaging.
A Potentially New Alternative for Russian Aviation
The RPD-150T could become the foundation for a broader Russian rotary-engine family if CIAM and Russian industry can reliably produce the engine’s claimed characteristics. This could provide the light aviation and UAV sectors of the country with a domestically produced alternative to imported propulsion systems.