Abstract
The basic characteristics of the straight wing type vertical axis wind turbine are presented under some simplifying assumptions and set of weighting functions is order to provide explicit the relationship between wind turbine efficiency and the aerodynamics characteristics of the airfoil. It is shown that pitching moment coefficient as will as minimum drag coefficient and lift coefficient has significant effect both on the starting capability and on the maximum efficiency of a wind turbine. Furthermore, a suggestion is mode with regard to the design of the mean lines to attain a preferable characteristics for the airfoil of the vertical axis wind turbine.
