BEIJING — China has begun flight testing a high-bypass ratio turbofan that will greatly improve the performance of the Y-20 heavy airlifter and potentially power the C919 commercial aircraft. The engine is the WS-20, according to local media that have published photographs of it in the left inboard position of an in-flight Ilyushin Il-76 used as a testbed. WS-20 is apparently the military name of the powerplant, which has also been called SF-A for civil purposes. It is a design ...

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