The first two-day solar-powered

The first two-day solar-powered flight was made June 1-3, marking a large step toward "perpetual" flight (AW&ST Sept. 15, 2003, p. 66). The SoLong drone by AC Propulsion went through two full-night sessions on batteries that had been charged during the day by solar cells on the wing (AW&ST May 2, p...

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