Significant gap between China and South Korea in turbofan engine development: China's WS-21 has entered mass production, while South Korea remains at the initial research and development stage.

China-South Korea Turbofan Gap: South Korea Aims for 9.98-Ton Thrust, China Has Already Achieved Mass Production

The domestically developed South Korean turbofan engine, equivalent to the F414 class, targets a thrust range of 6.8 to 9.98 tons—comparable to China's WS-21. However, while the WS-21, serving as the powerplant for the J-35A, has already achieved mass production and large-scale application, South Korea’s new engine remains in its early development phase. The gap between the two is far more than just "a single step."

The WS-21 is a derivative of the WS-13E, with a thrust of approximately 9.5 tons and high technical maturity, having successfully resolved mass production challenges. In contrast, South Korea’s development team faces significant hurdles including shortages in high-temperature alloys, talent scarcity, and external technological blockades—all of which are unlikely to be overcome in the short term. More critically, developing aircraft engines requires not only “technical reserves” but also “engineering implementation capability.” China benefits from a solid foundation built on the WS-13 technology and decades of accumulated expertise across its supporting industrial chain. Meanwhile, South Korea, aside from Hanwha Aerospace’s limited maintenance experience, is essentially starting from scratch.

Some argue that “South Korea can first install a 15,000-pound-thrust engine on an unmanned combat aircraft,” but the technical requirements for unmanned aircraft engines differ significantly from those of manned aircraft. Even if such a test proves successful, scaling up a “low-thrust unmanned engine” to the 9.98-ton level required for manned fighters involves countless engineering challenges yet to be solved. It will likely take many more years before South Korea can achieve indigenous KF-21 production relying solely on this engine. After all, the gap in aviation engine capabilities can never be bridged merely by setting ambitious goals.

Original source: toutiao.com/article/1862799864458252/

Disclaimer: The views expressed in this article are solely those of the author.