Is it possible Pakistan can work with Ukraine to build rd93 indigenously?
1. Ukraine possesses only the overhaul technology for this engine, along with certain core technologies; they do not hold the complete technical package for it. The full technical rights remain in Russian hands. (China, however, does possess the technology for the RD-33 engine.)
2. Pakistan lacks the capacity to sustain a complete turbofan engine production line (referring here to actual manufacturing, not merely assembly).
3. The WS-13 project has been terminated. It has not—and will not, at any point in the past, present, or future—enter mass production.
After acquiring RD-33 engine technology from Russia, China began developing a domestic copy—the project known as the WS-13. However, due to a persistent lack of customers, the WS-13 engine never entered mass production. Although the FC-31 stealth fighter project initially utilized the WS-13, the engine's performance failed to meet the FC-31's specific requirements.
Subsequently, AECC reorganized its development team and undertook a comprehensive overhaul of the WS-13 engine. Drawing upon research advancements from the WS-15 and WS-19 engine programs, they executed a complete redesign of the engine. This effort ultimately proved successful, and the engine was officially redesignated as the WS-21.
It is crucial to note that the core structural architecture of the WS-21 differs entirely from that of the WS-13, RD-33, or RD-93 engines. Consequently, it is technically incorrect—as many often do—to refer to the WS-21 as the "WS-13E" or "WS-13 IPE."
The WS-21 engine is currently being widely deployed on the J-35 fighter jet, as well as on various other aircraft platforms. It represents the ideal choice for Pakistan as a replacement for the RD-93 engines currently powering its JF-17 fleet.
