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Ion propulsion can also be a revolutionary technology for powering cargo drones.
Ion propulsion technology, if ever realized, could end the reliance on fossil fuels and transform the travel industry.
Check this out: MIT engineers have already designed and tested an ion propulsion engine on an aircraft!
https://news.mit.edu/2018/first-ionic-wind-plane-no-moving-parts-1121
Ion engines are currently used only in space and would be very impractical in earth’s atmosphere.