Solar Impulse's Chief Executive Officer and pilot Andre Borschberg performs a low altitude go-round procedure with the solar-powered HB-SIA prototype aircraft during a test flight at Payerne airport April 18, 2011. [Photo/Agencies]
Solar Impulse's Chief Executive Officer and pilot Andre Borschberg performs a low altitude go-round procedure with the solar-powered HB-SIA prototype aircraft during a test flight at Payerne airport April 18, 2011. [Photo/Agencies]