Wind turbine with savonius-type rotor

A Savonius rotor assembly driven by a moving fluid, said assembly comprising:

• a support;
• a rotor mounted on the support for rotation about an axis, the rotor including a first blade and a second blade disposed symmetrically about the axis, the rotor having a cross section defined by a plane perpendicular to the axis, the rotor in the cross section including the first and second blades, each having:
• an outer edge and an inner edge with the outer edge moving in a path of a first circle around said axis, said circle defining a diameter of the rotor;
• a substantially linear portion extending from the inner edge toward said outer edge and terminating at a first location, said inner edge extending substantially beyond said axis on a side thereof opposite said outer edge and spaced from said first circle by a distance less than about 0.2 times said diameter, said linear portions of said first and second blades being substantially parallel;
• a first curved portion which is substantially an arc of a second circle, said first curved portion tangent to the substantially linear portion at said first location, said first curved portion terminating at a second location, said first curved portion tangent to said first circle at said second location;
• and
• a second curved portion tangent to the first curved portion at said second location and substantially coincident with said first circle.