Boeing Value Chain Analysis
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The three engine manufacturers developed more efficient and quieter turbofans to power the 777, and all three have been selected by 777 customers. Engine selection for the 777 is split at roughly one-third for each of the engine manufacturers. Pratt & Whitney offers the PW4000 series of engines, General Electric offers its GE90 series, and Rolls-Royce offers the Trent 800 series of engines.
All three engines offer excellent fuel efficiency, while allowing the 777 to be as quiet as a 767, even though the 777 engines provide 40 percent more power. Key factors in this performance are new, larger-diameter fans with wide-chord fan blade designs and bypass ratios ranging from six-to-one to as high as nine-to-one. This compares to the typical five-to-one ratio for the engines of previous twin-aisle jets.
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