The solar powered Aircraft “Solar Impulse” , HB-SIA prototype, a pioneering Swiss bid to fly around the world on solar energy, takes off on its fifth test flight, with for the first time on command Solar Impulse Chief Executive Officer Andre Borschberg, at the military airport in Payerne, Switzerland, May 24, 2010. The Solar Impulse project aims to circumnavigate the world with an aircraft, with a 63.40 metres wingspan, powered only by solar energy. EPA/LAURENT GILLIERON +++(c) dpa – Bildfunk+++