How are all these turbofan engine programs suppose to share the same talent pool ? The WS-10 and WS-20 is made in Shenyang, the WS-15 is made in Xi'an and the WS-13 is made in Guizhou. They may all share their experience and knowledge with each other but I doubt that they shift people around back and forth. They should all have their own development teams. The only thing being shifted would be funding. It will most likely be the case that the WS-10, WS-20 and the WS-15 will recieve a lot more funding than the WS-13. The WS-13 program is said to have been started in 2000. that's 15 years ago. Its a smaller and less powerful engine than the WS-10 and with the apparent success of the WS-10 there should have been hand me down experience and expertise from Shenyang to Guizhou. So its not strange to see the WS-13 being tested at the moment unless really all funding have been cut to the WS-13 program. But on the other hand we have the agreement for the uprated RD-93MA that suppose to come in 2019. So I have my doubts about it as well.