A computering directional drive for stratospheric balloon using wind variation versus altitude

Taking into account the wind variation, mostly stable during summer time at latitudes around 38 degrees North, with direction E-W in the upper stratosphere (28÷40 Km), and W-E direction in the low stratosphere (16 ÷21 Km), it is proposed a drive management system that allows to launch a balloon and to retrieve it around the same site after a stratospheric flight of about 6 hours. It is presented the strategy to manage the balloon flight at different altitudes versus the dynamic vertical state with the purpose to provide balloon guidance on a pre-established retrieving spot. This method may be used for transmediterranean flights extended up to the Atlantic Ocean with re-entry in the Spanish territory with an increased flight duration time of about 10 hours.