China has begun flight testing a high-bypass-ratio turbofan that is expected to greatly improve the performance of the Y-20 heavy airlifter and potentially power the C919 commercial aircraft. The engine is the 28,700-lb.-thrust WS-20, according to local media that have published photographs of it in the left inboard position of an inflight Ilyushin Il-76 testbed. WS-20 is apparently the military name of the powerplant that has also been called SF-A for civil purposes. It is a design of the ...

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