Long-running plans to flight-test a Safran Aircraft Engines-developed counter-rotating open-rotor (CROR) engine demonstrator under the European Union’s Clean Sky technology initiative have been shelved. The decision, confirmed by Jean-Francois Brouckaert, project officer for the Clean Sky engine demonstrator programs, is a blow to proponents of the fuel-saving concept and could well delay by decades development of a viable commercial open rotor. Ironically, news of the move emerges as ...

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