Design of Solar UAVs for long range missions for civilians and military operations. X for innovation and Sun for Sustainability. XSun develops revolutionary flying electric solar machines. These unmanned machines (or drones) are concentrates of technologies and innovations from the space sector. SolarXOne, the first range developed: 5m, 30kg, capable of carrying multiple sensors is perfect for aerial data acquisition while being extremely quiet. Resulting of 5 years of R&D (3 theses), about twenty patents, having more than 600 test flights, SolarXOne carries out payed missions throughout the world in the civil and military world. XSun, through SolarX programs, is pushing for a greener aviation.