Abstract: The present invention is directed to a venturi rotor apparatus for producing power from the rotation thereof. The apparatus comprises a support and a central core having a spherical triangular cross-section mounted on the support for rotation about a central axis through the core. A plurality of support arms, fixed to the central core, extend radially outward therefrom at the verticies of the spherical triangle. At least three airfoils are fixed to a radially extended portion of the support arms such that a gap is formed between the surface of the central core and the surface of the airfoils, with the airfoils being aligned on an axis parallel to the axis of the central core. Fluid flow, such as air flow, having at least a component in the direction perpendicular to the axis of the central core flows through the gap producing a venturi effect for enhancing the movement of the airfoils about the axis of the central core.