Boeing has selected the General Electric GE9X to power its proposed 777X derivatives after rejecting proposals from Rolls-Royce and Pratt & Whitney. The decision means GE will continue to be the sole engine supplier for the various versions of the airliner, as its GE90s power current-production 777s. Boeing said the GE9X was "the best match to the development programme, schedule and airplane performance" for the 777X. GE says the GE9X will offer a 10% lower fuel burn and a 25% reduction in NOx emissions in comparison to the GE90. According to GE, the 16-blade GE9X will produce 102,000 Ib (453.7kN) of thrust, feature a 131.6in (3,342mm) diameter fan, a 10.3-to-1 bypass ratio and an 11 -stage high-pressure compressor. Ceramic matrix composites will be used in the combustor and high-pressure turbine, and composites for the blades and casing.
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