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SolarStratos, planes

Swiss pilot Raphaël Domjan flew the SolarStratos solar-powered aircraft to 8,224 meters on Aug. 10, setting a personal record but falling short of the 9,235-meter world mark held by Solar Impulse.
The SolarStratos plane didn't reach its goal of 10,000 metres but still exceeded its highest solar flight ever.
SolarStratos is equipped with 22 sq m (237 sq ft) of solar panels. These charge a 20 kWh lithium-ion battery pack, which powers a 32-kW electric motor that in turn drives a 2.2-m (7.2-ft) propeller.
The SolarStratos team expects the commercial, two-seater plane to hit the skies in 2018 without the use of “large quantities of energy or helium” it’d usually take to reach space.
SolarStratos is 9.6 metres long, and its huge wingspan of 24.8 metres accommodates the 22 square metres of high-spec solar panels topping the wings, and allows for flying at low speeds.
Swiss aviator Raphael Domjan came close to breaking the world record for solar-powered flight, reaching an altitude of 8,224 meters.