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" ... While they proved that ionic propulsion can work, or electroaerodynamic propulsion, as Barrett prefers to describe it, it’s still a long, uncertain road to scaling up the technology to aircraft that could carry people. The test aircraft was extremely energy inefficient—just 2.6% of its electrical energy was turned into propulsive force—and the thrust density, a measure of the thrust in proportion to the frontal area of the aircraft, was some 300 times smaller that of an airliner. ... "