Facing their most stringent performance targets yet for Airbus's and Boeing's newest big twin programs, General Electric and Rolls-Royce are leaving no stone unturned in their search for better efficiency.For Rolls-Royce, as it deals with the closer timeline of the A350 development, the focus is eking out fuel burn improvements for the Trent XWB on the A350-900 and making the most of program delays to inject new technology into the version for the A350-1000. General Electric, in pole position in the big twin market on the Boeing 777 with the GE90, is meanwhile refining design details of the next-generation GE9X aimed at Boeing's 777X derivative.
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