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Operational history Īs one of the three available engines for the new Boeing 777, the GE90 was an all-new $2 billion design meant to handle transoceanic routes, in contrast to the offerings from Pratt & Whitney and Rolls-Royce which were modifications of existing engines. The nacelle has a maximum diameter of 166 in (4,200 mm). The higher-thrust GE90 variants are the first production engines to feature swept rotor blades. Consequently, GE elected to increase core capacity, which they achieved by removing one stage from the rear of the HP compressor and adding an additional stage to the LP compressor, which more than compensated for the reduction in HP compressor pressure ratio, resulting in a net increase in core mass flow However, GE also needed to increase core power to improve net thrust at high flight speeds. General Electric incorporated an advanced larger diameter fan made from composite materials which enhanced thrust at low flight speeds. The higher-thrust variants, GE90-110B1 and -115B, have a different architecture from that of the earlier GE90 versions. The fan/LPC is driven by a 6-stage low-pressure turbine. A 3-stage low-pressure compressor, situated directly behind the fan, supercharges the core. The GE90's 10-stage high-pressure compressor developed a then-industry record pressure ratio of 23:1 and is driven by a 2-stage, air-cooled, HP turbine. The bigger and higher-thrust -115B version that powers the second generation 777 (-300ER, -200LR, and -200F) had its first run at the GE facility in Peebles, Ohio in November 2001. Rowe would have paid for the development of putting it on an A330, but Airbus' strategy for long-haul was the four-engine A340, missing the market favouring twins. Initially the GE90 was only one of three 777 options and GE Aviation then-CEO Brian H. GE Aviation teamed with Snecma (France, 24%), IHI (Japan) and Avio (Italy) for the program.
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GE was not interested in having the GE36 cannibalize the CFM56, and while "the UDF could be made reliable by earlier standards, turbofans were getting much, much better than that." However, GE integrated the UDF's blade technology directly into the GE90. However, when the V2500 ran into technical problems, sales of the CFM56 took off. GE's GE36 Un-Ducted Fan ( propfan) was meant to replace the CFM International CFM56 high-bypass turbofan which was initially uncompetitive against the rival IAE V2500. The GE90 was developed from the NASA 1970s Energy Efficient Engine, a prototype variant of the General Electric CF6. A 1998 CFD simulation of airflow through the engine