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The Darrieus model was invented by a French engineer named George Jeans Maria Darrieus. He presented his patent in 1931 in the US [1] which included curved and constant section blades, now called Darrieus-H or Giromill. Its boom was won between the 1970s and 1980s, and then was dismissed for various reasons, compared with horizontal axis turbines [2].In particular, vertical axis wind turbines Darrieus type today are being considered as one of the most attractive solutions to be installed on roofs of buildings (auto sustainable buildings), due to its low visual impact, reduced noise emissions and better response to a turbulent flow [3].A difficulty of the Darrieus type wind turbines is that it lacks self starter. This is partly because in the past have been used only symmetrical airfoils, such as the NACA 4-digit number, for exampled NACA 0012, 0015, 0018. This inability auto start was a technical disadvantage for this type of wind turbine. In recent years it has begun experimenting with airfoils not symmetrical and it has been determined that in some cases they allow the booting [4].In this paper the results of a series of tests with a small turbine Darrieus-H four blades are presented, with a non-symmetrical profile of the S series, which was tested in a wind tunnel, varying the pitch of the blade, to find the wind speed auto start, which was 4 m / s

Wind Tunnel Testing of a Small Wind Turbine Darrieus-H, With Asymmetric Airfoil, For Auto Start