Darrieus wind rotor is a vertical axis wind turbine that is a very promising kind of wind converters at remote and domestic locations that have soft and weak wind potential and speed. but from the quantitative comparison with horizontal axis wind turbines. this type of turbines has a weak performance. Additional researches are still needed to develop its efficiency to identify all the... https://www.roneverhart.com/Mara-s-Kaleidoscope/