A kite system having a kite (14) and a hauling rope (15) which extends between the kite (14) and a tow point (16). A marking holder (25) is disposed between the tow point (16) and the kite (14). The marking holder (25) is conceived for changing between an entrained state in relation to the hauling rope (15), and a free-running state in relation to the hauling rope (15). A fitting installation (31) initiates a changeover between the entrained state and the free-running state of the marking holder (25). The invention moreover relates to a method for operating a kite system.

A kite system having a kite (14) and a hauling rope (15) which extends between the kite (14) and a tow point (16). A marking holder (25) is disposed between the tow point (16) and the kite (14). The marking holder (25) is conceived for changing between an entrained state in relation to the hauling rope (15), and a free-running state in relation to the hauling rope (15). A fitting installation (31) initiates a changeover between the entrained state and the free-running state of the marking holder (25). The invention moreover relates to a method for operating a kite system.

Implementations of wind energy devices may include a frame coupled to each of a first rotor wheel, a second rotor wheel, a third rotor wheel, and a fourth rotor wheel. Implementations of wind energy devices may also include a first cable configured to rotate about the first rotor wheel and the second rotor wheel and a second cable configured to rotate about the third rotor wheel and the fourth rotor wheel. Implementations of wind energy devices may also include a plurality of airfoils coupled between the first cable and the second cable. Implementations of wind energy devices may include a first generator and a second generator. Implementations of wind energy devices may include a controller coupled to the first generator and the second generator. The controller may be configured to control a speed of rotation of the plurality of airfoils.

Implementations of wind energy devices may include a frame coupled to each of a first rotor wheel, a second rotor wheel, a third rotor wheel, and a fourth rotor wheel. Implementations of wind energy devices may also include a first cable configured to rotate about the first rotor wheel and the second rotor wheel and a second cable configured to rotate about the third rotor wheel and the fourth rotor wheel. Implementations of wind energy devices may also include a plurality of airfoils coupled between the first cable and the second cable. Implementations of wind energy devices may include a first generator and a second generator. Implementations of wind energy devices may include a controller coupled to the first generator and the second generator. The controller may be configured to control a speed of rotation of the plurality of airfoils.

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.

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.

In some embodiments, an apparatus includes at least two towers arranged in each of a first direction and a second direction, each tower having a first end above a second end in a third direction. In some embodiments, the apparatus includes a bridling system connecting each of the towers to other towers, the bridling system connected to eachtower above the second end of the respective tower and balancing forces on each tower in the first and second directions.

In some embodiments, an apparatus includes at least two towers arranged in each of a first direction and a second direction, each tower having a first end above a second end in a third direction. In some embodiments, the apparatus includes a bridling system connecting each of the towers to other towers, the bridling system connected to eachtower above the second end of the respective tower and balancing forces on each tower in the first and second directions.

An axial impeller has a tubular housing mounted on bearings for rotation. The housing is capable of engaging a motor or generator directly or through a drive belt. Interior turbine blades are mounted on the housing wall. The blades may be hinged so they can rotate between a retracted position adjacent to the wall and an extended radial position. Rods penetrate the wall to position the blades between retracted and extended positions. When extended, the blades may be rotated to propel a fluid through the housing; and when retracted natural fluid flow is less restricted.

Consistent kinetic energy is harvested from wind and from flowing water in streams, rivers and tidal flows using a translating large sail, foil or wing which is permitted to translate in one direction, followed by translating in the opposite direction while pushing or pulling a cable, rod, or tether which in turn turns a pulley, wheel or other device from which traditional sources of power can be generated. The pulley wheel can be used to generate electricity, create hydrogen from water by electrolysis, compress air for transmission or storage, charge batteries, or perform work such as pumping water, heating water, moving objects, etc.