A new milestone has been achieved in Russia’s efforts to create a fully domestic engine for the world’s largest mass-produced transport helicopter. The first known 3D image of the PD-8V was revealed during a presentation by Russian software developer ASCON in October 2026. The image is reported to represent the helicopter engine being developed using KOMPAS-3D, a Russian computer-aided design (CAD) system. It provides a look into the engineering work that is behind a program that is designed to ensure the future of the massive Mi-26 helicopter.
The development is of strategic interest to Russian aviation. The Mi-26 continues to be one of the most important heavy-lift platforms in the country, capable of transporting vast quantities of personnel, military equipment, and cargo. Nevertheless, its continued operation is contingent upon the D-136 turboshaft engines, a legacy design with a strong connection to Ukraine’s manufacturing history. In an effort to eliminate that dependence, the PD-8V has the potential to enhance fuel efficiency and power output.
First glimpse of the PD-8V design
The image that is currently being circulated on Russian specialized aviation channels is noteworthy due to its ability to visually represent the program’s progress. Although a 3D model does not establish that a working engine has been completed, it demonstrates the use of digital engineering tools in the design process.
KOMPAS-3D is developed by ASCON, a Russian software company specialising in engineering design and product lifecycle solutions. The significance of domestic engineering software is further underscored by its inclusion in the PD-8V project, which is a strategic initiative by Russian industrial companies to decrease their dependence on foreign technology.
However, the model should be considered an early development milestone rather than evidence that the engine is prepared for testing. Detailed information regarding the design’s maturity, the completion of individual components, and the schedule for a first engine run has not been determined only by the image.
In March 2026, the PD-8V program was the subject of public discussion when representatives of UEC-Kuznetsov, an engine manufacturer based in Samara, confirmed that development of a new turboshaft engine for the Mi-26 was ongoing. The program is aiming to complete development by the end of 2031.
PD-8V builds on Russia’s new PD-8 engine
The PD-8V is expected to use the gas generator that was developed for the PD-8, as well as the turbofan engine that was developed by United Engine Corporation (UEC) for the SJ-100 passenger aircraft and the Be-200 amphibious aircraft.
A substantial industrial milestone has already been achieved by the original PD-8 program. UEC initiated the production engine assembly process in June 2026, following the engine’s receipt of its type certificate. The first two serial-production PD-8 engines for the SJ-100 program had been delivered by the corporation by August.
This establishes an indispensable technological foundation for the helicopter engine project. Modern materials, electronic engine control, digital engineering methods, and extensive testing have all been incorporated into the PD-8 program. Nevertheless, the modification of the engine’s external appearance is not sufficient to accommodate helicopter operation.
In order to operate a helicopter’s main and tail rotors, a turboshaft engine must transmit electricity through a transmission system. Its operating requirements are different from those of a turbofan, which generates thrust by accelerating air through the turbine. Hence, the PD-8V will necessitate a specialized design and qualification program that encompasses the components and systems necessary to withstand the rigorous operational conditions of a heavy-lift helicopter.
Despite the potential benefits of reusing technology from the two engines, the PD-8V must demonstrate its power, reliability, and durability for helicopter operations.
Why Russia needs to replace the D-136
The D-136, a powerful turboshaft engine that was developed during the Soviet era and produced in Zaporizhzhia, Ukraine, served as the foundation for the Mi-26. Motor Sich, which emerged as a major hub of Ukrainian aircraft engine manufacturing, maintained production in the wake of the Soviet Union’s dissolution.
The development of a domestic replacement has become a strategic priority due to the disruption of industrial and defense cooperation between Russia and Ukraine, particularly after 2022. The program became more urgent as access to Ukrainian manufacturing capabilities became increasingly problematic, although Russia has been discussing the replacement of the D-136 since the 2010s.
The PD-8V is designed to offer a Russian-produced alternative to the Mi-26, rather than relying on a supply chain that Russia can no longer reliably manage. Not only does this situation affect the production of new helicopters, but it also affects the long-term maintenance, engine replacement, and continued availability of aircraft that are already in service.
Additionally, a domestic engine could offer more flexibility in terms of spare-parts production, overhaul schedules, and future enhancements. These advantages will be contingent upon the establishment of a reliable industrial supply chain and the eventual production rate.
A more powerful engine for the world’s heavy-lift champion
The PD-8V is expected to improve fuel efficiency and deliver approximately 15% more power than the D-136, as per information reported by Russian industry sources in March 2026. The new engine is also expected to include a digital automatic control mechanism. These continue to be program objectives rather than operational outcomes that have been independently verified.
Additional power could provide major benefits for the Mi-26 during demanding missions, such as transporting military equipment, operating in challenging environmental conditions, and lifting large cargo. Enhanced fuel efficiency could also contribute to the reduction of operating costs, although the actual savings would be contingent upon the engine’s performance across various flight profiles.
The Mi-26 is a remarkable aircraft within its category. The helicopter’s inaugural flight occurred in December 1977, and it was operationalized in the early 1980s. It has since been employed for the transportation of oversized cargo, disaster relief, civilian heavy-lift operations, and military transport. It has a unique position in global aviation due to its capacity to transport cargoes that surpass the capabilities of the majority of other helicopters.
The PD-8V is expected to be finalized by the end of 2031, as indicated by the reported development schedule. Between the appearance of a digital model and an engine that is operationally ready, that timetable presents numerous significant obstacles.
The path to 2031
Engineers are required to complete the design, manufacture and assemble prototype hardware, conduct ground testing, and verify the engine’s reliability and performance. Extensive testing of the entire propulsion system, which includes the interaction between the engines, transmission, and rotor system, will be necessary for integration with the Mi-26.
Certification and production planning will also be crucial, particularly if Russia intends to use the PD-8V for the long-term support of its extant fleet and the production of newly manufactured helicopters.