Even as they develop engines promising 15-16% lower fuel burn on the latest narrowbodies, manufacturers are looking toward the 25-30% fuel-consumption reductions expected to be required by the mid-2020s to help keep airlines ahead of oil prices and emissions targets. For Safran group company Snecma, that means continuing work begun three decades ago on open-rotor engines—then with General Electric, but now with a European flavor. Snecma is preparing to begin scaled wind-tunnel tests ...

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