goldenpanda
Banned Idiot
There are certain advantages not to use the WS-10A at all. First the advantage of using a local engine is kind of moot, and rather symbolic. Only to say it's Made in China and tactically, it has no significance. Developing an indigenous engine comes in handy when you are facing a possible boycott from your suppliers. But the opposite is in this case, since your supplier is dying to sell you, willing to give you good prices and the best technology.
Second, to introduce WS-10A means an entirely new system of logistical infrastructure has to be introduced for this engine. That means training of technicians, a new maintenance regimen, inventory of parts, distribution system and so on. Whereas for the AL-31F, you alrready have such a structure. In the end, its only more inconvenient for the PLAAF.
Third. Concept of WS-10 arose in the eighties when China and the Soviet Union is still in a faceoff. Even then after that China still distrusts Russia and wonders if a long term alliance or relationship can be maintained as both do not trust each other. So if Russia happens to embargo China, China can fully turn both J-11 and J-10 indigenous and not be reliant on Russia. However, in 2006, the geopolitics have changed, their relationship has more than sustained into an alliance. At the same time, China is in need now of Russia's oil and mineral resources. and needs to be in the good side of Putin. Also helps to release those RD-93s for Pakistan second export. But nonetheless, purchases from Russia also serve as a political tool, they can dual role as cards to help get better access to Siberian resources.
These are all good points. What I hear repeated from Chinese engineers, however, is this theme: waiting until domestic products improve is the wrong road. You have to do it yourself even if you don't do it as well. It's the only way to get better--and getting your own people to a better level is more valuable than any short term savings. (comparative advantage can go to hell!) Especially in military technology which take decades of experience, not just theoretical knowledge, domestic development must never stop.
The trend is to recognize the mistaken strategy in the 80's to rely on imported knowledge. For whatever reason we don't learn from western experience the way we learn from our own. Do it to get the experience, that's the belief today. That's why you see a wide range of "uneconomical" projects, not only in military but civilian products -- nuclear power, rockets, spacecraft, aircraft, semiconductors, cars, bullet trains, China is doing them all.
Economists don't know how to price learning, doesn't mean we won't value it.