An apparatus for extracting power includes a track and an airfoil coupled to the track. The track includes first and second elongate sections, where the first elongate section is positioned above the second elongate section. The airfoil is moveable in opposite directions when alternately coupled to the first elongate section and second elongate section.

A novel lightweight high efficiency wind generator with low noise and low vibrational levels comprising a vertical mast with a rotation element mounted at the top of the mast, with a frame attached to the rotation element with its bottom, such that the rotation element provides axial rotation of the frame in the range from 0 to 360, is disclosed. The frame comprises a three-dimensional truss frame construction with traverses, to which at least one rigid closed elliptical base is attached. The at least one elliptical base carries a guide rail with grooves, the guide rail comprises at least one pair of rollers in the grooves which can rotate and roll in the grooves along the entire closed circuit of the elliptical base. Along the entire contour of the elliptical base blades are radially fixed and arranged in one plane using carriages.

A novel lightweight high efficiency wind generator with low noise and low vibrational levels comprising a vertical mast with a rotation element mounted at the top of the mast, with a frame attached to the rotation element with its bottom, such that the rotation element provides axial rotation of the frame in the range from 0 to 360, is disclosed. The frame comprises a three-dimensional truss frame construction with traverses, to which at least one rigid closed elliptical base is attached. The at least one elliptical base carries a guide rail with grooves, the guide rail comprises at least one pair of rollers in the grooves which can rotate and roll in the grooves along the entire closed circuit of the elliptical base. Along the entire contour of the elliptical base blades are radially fixed and arranged in one plane using carriages.

Provided is a wind power system. The wind power system may comprise: a rail for providing a movement path in a horizontal direction; a moving body configured to slide and move along the movement path of the rail; a plurality of blades installed on the moving body and providing power for the movement of the moving body on the basis of energy from the wind; and a nacelle having a generator for generating power by rotating in conjunction with the movement of at least one of the moving body and the blades.

An apparatus for extracting power includes a track and an airfoil coupled to the track. The track includes first and second elongate sections, where the first elongate section is positioned above the second elongate section. The airfoil includes a suction surface lying between a pressure surface and the track, and is moveable in opposite directions when alternately coupled to the first elongate section and second elongate section.

An apparatus for extracting power includes a track and an airfoil coupled to the track. The track includes first and second elongate sections, where the first elongate section is positioned above the second elongate section. The airfoil includes a suction surface lying between a pressure surface and the track, and is moveable in opposite directions when alternately coupled to the first elongate section and second elongate section.

A thrust generating device has a simple structure and can effectively control the magnitude of a Magnus force generated at a cylindrical blade in accordance with the direction of a flow acting on the cylindrical blade. A Magnus-type thrust generating device includes a first member that has a first rotational axis and that can rotate about the first rotational axis; and a second member that is disposed at a rear surface side in an advancement direction of the first member 1. (M?L)/L<2 is satisfied, where L is the distance from the first rotational axis to the most distant part of the surface of the first member and M is the distance from the first rotational axis to the closest part of the surface of the second member in a plane perpendicular to the first rotational axis of the Magnus-type thrust generating device.

A thrust generating device has a simple structure and can effectively control the magnitude of a Magnus force generated at a cylindrical blade in accordance with the direction of a flow acting on the cylindrical blade. A Magnus-type thrust generating device includes a first member that has a first rotational axis and that can rotate about the first rotational axis; and a second member that is disposed at a rear surface side in an advancement direction of the first member 1. (M?L)/L<2 is satisfied, where L is the distance from the first rotational axis to the most distant part of the surface of the first member and M is the distance from the first rotational axis to the closest part of the surface of the second member in a plane perpendicular to the first rotational axis of the Magnus-type thrust generating device.

A wind generator, comprising: at least one wind wheel which is mounted to be rotatable around a rotational axis, and which has one or more blades or other wind-guiding surfaces for converting flow energy of wind into rotational energy, at least one generator, which is coupled to a hub or shaft of the wind wheel or to an output shaft of a gear connected thereto, for converting the rotational energy into electrical energy, wherein a center of gravity of the wind wheel, together with a hub and rotor shaft and rotatable parts which are coupled to the hub or rotor shaft and rotate around the same rotational axis, is translationally movable in a horizontal or approximately horizontal direction, characterized in that: the generator is either a direct current generator or is on its output side coupled to a rectifier to provide the electrical energy as direct current, and at least one energy storage is coupled to a direct current output of the generator or of the rectifier for receiving and storing the electrical energy.

A wheel-hub driven wind turbine apparatus is disclosed. One embodiment of the apparatus may include a body and at least one vertical-axis wind turbine blade mounted on the body to translate wind forces exerting on the at least one vertical-axis wind turbine blade to the body, causing the body to move. The apparatus may also include at least one wheel-hub attached to the body and configured to rotate when driven by the movement of the body. The apparatus may also include at least one generator coupled to the at least one wheel-hub to generate electrical power when driven by the rotation of the at least one wheel-hub.