The  portable  wind  turbine BENTU  allows  energy production for  free  time personal  or professional  use. Transportability, lightness,  easy to  mount  and use are the requirements put at the base of the project development. The produced and patented prototype is based on a windsurfing sail characterized by lightness, resistance and portability properties. The system is usable in isolated areas or difficult to reach, for example mountain areas or on pleasure boats for the powering of communication/navigation instruments or data analysis.