The Chinese defense industrial base is infamous for its tendency to “borrow” from foreign designs, particularly in the aerospace industry. Almost the entirety of China’s modern fighter fleet have either borrowed liberally from or directly copied foreign models. The J-10 was reputedly based on the Israeli IAI Lavi and by extension the United States’ General Dynamics F-16; the J-11 is a clone of the Russian Su-27; the JF-17 is a modern development of the Soviet MiG-21; the J-20 bears an uncanny resemblance to the F-22, and finally, the J-31 is widely believed to rely heavily on technology appropriated from the F-35 Joint Strike Fighter. Appropriation saves China time and money on research and development, allowing it to modernize the PLAAF at a fraction of the cost of its competitors. However, the appropriation strategy remains constrained by bottleneck technologies due to lack of testing data and industrial ecology. This problem is starkly illustrated by China’s ongoing difficulty in producing a high-quality indigenous jet engine.
The problem of technology mismatch, at its root, is that the thief lacks trade secrets and human capital associated with the manufacturing and assembly of a system. At the very least, this absence can make the replication of foreign systems a costly and time-consuming process, as the thief needs to develop manufacturing procedures from scratch. At worst, it can lead to seriously substandard components that reduce the capabilities and reliability of a system. Chinese efforts to reverse engineer certain Russian jet engines during the 1990s and 2000s invariably produced engines with extremely short lifespans, and without the power of their Russian counterparts . Even today, jet engines remain an obstacle for PLAAF fighter modernization, with its early 5th generation prototypes notably underpowered. Further complicating the problem, Russia is wary of supplying engines more powerful than the AL-31 used to power its Su-27s. However, China has several avenues to work around this.
The most obvious option is simply to build a better indigenous engine. In 2016, China’s 13th Five-year Plan for the National Development of Strategic Emerging Industries emphasized the importance of improving the performance of indigenous jet-engine designs and the further development of the aerospace industry. It appears that there has been at least some success, as the latest J-20 prototypes are powered by upgraded WS-10 engines that are supposedly stealthier and more powerful than the AL-31. However, the lack of public information regarding China’s indigenous engine programs makes their true quality difficult to ascertain. Early models of the WS-10 used to power Chinese Flankers proved dramatically inferior to the AL-31. While the privately owned Chengdu Aerospace Superalloy Technology Company (CASTC) has recently made great advances in turbofan technology, allowing for hotter, more efficient engines, the fruits of its breakthrough have yet to reach frontline PLAAF units.
If the private sector proves key to breaking through various technological bottlenecks in elements of aerospace design, then political ramifications may follow. Presently, state-owned aviation manufacturers are politically ascendant, with some state-owned enterprise leaders even granted governorships. If privately owned firms like CASTC produce superior results, they may rise in political influence, the more established and politically connected state firms could consume them, or they could form comprehensive public-private partnerships with state-owned firms while retaining a degree of autonomy. Whatever the case, the implications could be profound for the Chinese defense industrial base and national innovation system.
A simpler method is to buy foreign fighters that have advanced engines, as was the case with the PLAAF’s purchase of Su-35s from Russia . The Su-35’s AL-41F1S, alternatively known as the ALS-117S, is an exceptionally powerful thrust-vectoring engine which represents a quantum leap over the AL-31. While China originally expressed interest in the ALS-117 as a stand-alone product, Russia’s refusal to export the engine alone necessitated the purchase of the Su-35. Russia insists that extensive IP protections safeguard the ALS-117 from Chinese reverse engineering. However, given China’s questionable record of respecting intellectual property, it is plausible that they will attempt to reverse-engineer parts of the ALS-117 anyway, although this is harder than it sounds. Russian sources claim it is nearly impossible to reach the “heart” of the engine without breaking it. Furthermore, China’s previous difficulties with the WS-10, despite ready access to the AL-31, show that access to foreign engine designs does not immediately translate into the ability to produce engines of similar quality. Furthermore, disrespecting Russian IP protections it had agreed to honor might restrict China’s access to advanced Russian systems in the future. Finally, if the Russians are correct that it is effectively impossible to access the ALS-117’s core without breaking it completely, attempts at reverse-engineering it would rob the PLAAF of advanced combat aircraft that would quite obviously be useless without engines. Thus, while the PRC may derive short-term advantage from reverse engineering the ALS-117, it risks killing the goose that laid the golden egg. However, the grim prognosis for the future of the Russian arms industry may force it to look the other way, as losing access to the Chinese market would be a body blow. Russia’s leverage is also shrinking; as China’s technological and industrial base improves, the importance of Russian imports continues to decrease. Beijing may feel confident enough in the disparate power differential to call Moscow’s bluff. Yet doing so risks derailing the positive relationship in which the two countries have invested considerable diplomatic capital.