How GE’s Adaptive Engine Differs From Earlier Variable-Cycle Designs

GE engine concept
Blue marks the cooler third stream flow on this simplified GE concept.
Credit: GE Aviation
Details of the operating cycles of the new-generation adaptive engines remain sparse, but the key difference between the GE XA100/P&W XA101 and earlier variable-cycle concepts such as GE’s XF120 from the 1980s is the addition of the third air stream, which is external to both the core flow and...

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