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Betz law

P {max}=(16/27)*(1/2)p*S*V^3

Soit: P{max}=0.37*S*V^3

P = power in Watt (W) ;

S = surface balayée par les pales exprimée en mètres carrés (m2) ;

V = Speed of wind (m/s)

Darrieus's 1927 patent also covered practically any possible arrangement using vertical airfoils. One of the more common types is the H-rotor, also called the Giromill or H-bar design, in which the long "egg beater" blades of the common Darrieus design are replaced with straight vertical blade sections attached to the central tower with horizontal support

Giromill wind turbine

(Cycloturbine or wing)

ferg

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