Safran Aircraft Engines’ endeavor to demonstrate a counter-rotating open-rotor (CROR) engine is taking place amid a widespread faltering interest for the architecture, as the replacement of today’s single-aisle commercial aircraft has been postponed repeatedly. In addition, technical challenges facing the CROR concept, the rise of the geared turbofan (GTF) and low fuel prices are combining to slow development. In the late 2000s, two other major engine-makers—GE Aviation ...

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