Rotor for a vertical axis wind turbine

A rotor for a vertical axis wind turbine comprising:

• first and second blades connected to one another and arranged to rotate around an axis;
• wherein the first and second blades are disposed 180° apart with respect to one another and are offset from the axis in a radial direction;
• wherein an inner edge of each blade is spaced radially inwardly from an outer edge of the opposing blade to form a pair of diametrically opposed openings which open in opposite directions;
• wherein each of the first and second blades comprises a first curved section and a second oppositely curved section, the first and second curved sections being separated by a point of inflection;
• and
• wherein the first and second curved sections of the first and second blades overlap one another to form a passageway between the first and second blades which extends between the openings;
• wherein each of the first and second curved sections has a radius of curvature which is greater than or equal to the radius of the cylindrical volume swept by the first curved sections, and
• wherein each of the first and second curved sections has a radius of curvature which is greater than or equal to the radius of the maximum cylindrical volume swept by the blades.