Testing is now underway on General Electric’s high-pressure core of its  GE9X engine in development for Boeing’s 777X twinjet project, paving the way for the first full engine tests slated to begin in 2016. The core, which includes the high-pressure (HP) compressor, turbine and compressor, also demonstrated operability above the maximum “redline” speeds and achieved compressor pressure ratios over and above the engine’s 27:1 design target, says GE. Testing ...

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