LONDON—Airbus, Rolls-Royce and Siemens are taking the biggest step yet toward hybrid-electric flight with a plan to take a 2.5-megawatt electric generator aloft on a highly modified BAe 146 regional aircraft.  The E-Fan X project will see the generator—at least eight times more powerful than anything previously flown—integrated into the envelope of a Rolls-Royce AE2100 engine and mounted in the rear fuselage. This will provide power to a Siemens-developed electric ...


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