JOHN MEAD / SCIENCE PHOTO LIBRARY JOHN MEAD / SCIENCE PHOTO LIBRARY
Wind power. A Darreius turbine or Vertical Axis Wind Turbine (VAWT), near Albuquerque in New Mexico, USA. The two catenary-shaped aluminium blades are fixed along a rotating column giving the structure its distinctive 'eggbeater' appearance. Despite the fact that this turbine is not self-starting even in high winds, it does have a number of advantages over the conventional horizontal axis aerogenerator; the axial symmetry of its design obviates the need for re-alignment in response to shifting wind direction and their is no need for the generator itself to be mounted at the top of the tower.
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