There are difficult technical questions to be answered before it is clear whether electric propulsion will be viable for anything larger than general-aviation aircraft. Many of them are being uncovered as NASA asks Rolls-Royce LibertyWorks and United Technologies Research Center (UTRC) to take a closer look at a potential near-term hybrid turbine-electric engine for single-aisle airliners. Even with hybrid propulsion, a single-aisle aircraft will require significant battery power. ...

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