The vertical wind turbine and system generally comprises a rotor assembly having a plurality of blades, a fixed central spindle having a central axis for supporting rotation of the rotor assembly, a blade adjustment mechanism assembly for adjusting the blade angle of attack throughout rotation of the rotor assembly, and a support framework for supporting the rotor assembly at an elevated position in order to gain access to a sustained source of wind. The wind turbine may be operably coupled with a power electric generator or other device which transfers mechanical energy into electrical energy as a combined system.

Disclosed is a vertical axis wind turbine apparatus. The apparatus includes carousal shafts operatively connected to a fixed turbine axis. The turbine blades are pivotally attached to carousal plates. The wind-facing turbine blades get exposed to a maximum area by stretching away from the fixed turbine axis, and the turbine blades that are not exposed to wind get folded inside toward the fixed turbine axis. The stretching and folding of the blades is affected by timing and restricting shafts, which emerge from the offset timing shaft. The present construction reduces the drag caused by turbine blade exposure in negative wind direction and increases energy production by simultaneously allowing maximum blade exposure in the positive wind direction. Furthermore, the apparatus in one embodiment includes counterweights to provide more stability to the offset shaft operation.

A vertical axis wind turbine includes: a central axis that extends in a substantially vertical direction; a plurality of configurable airfoils disposed about the central axis, the plurality of configurable airfoils physically coupled to rotate together about the central axis; an angle adjustment mechanism configured to adjust an angle formed between a configurable airfoil and a radius that extends from the central axis as the configurable airfoil rotates about the central axis; and a profile adjustment mechanism that is configured to adjust a profile of the configurable airfoil as the configurable airfoil rotates about the central axis.

A hydrokinetic turbine system for harvesting energy from riverine and tidal sources, including a first floating dock, a marine hydrokinetic turbine mounted on the first floating dock, and a second floating dock. The system further includes a winch assembly mounted on the second floating dock and operationally connected to the first floating dock and a linkage assembly operationally connected to the first floating dock and to the second floating dock. The linkage assembly may be actuated to pull the first floating dock into contact with the second floating dock. The linkage assembly may be actuated to distance the first floating dock from the second floating dock, and the winch assembly may be energized to orient the first floating dock into a position wherein the marine hydrokinetic turbine is above the first floating dock and wherein the winch assembly may be energized to orient the first floating dock into a position wherein the marine hydrokinetic turbine is below the first floating dock.

Underwater vehicles capable of self-propulsion are described. An underwater vehicle includes a cross-flow turbine including two or more foils spaced apart from a main shaft. The foils have a pitch that is adjustable under control of a pitch control mechanism. The underwater vehicle also includes a frame supporting the main shaft. The frame enables rotation of the cross-flow turbine. The underwater vehicle additionally includes a generator-motor set including rotor and stator elements. The rotor element is in rotary communication with the main shaft.

The invention relates to a renewable energy power generating device for converting wind and/or water-flow energy into useable electrical power. The power generating device includes a support structure (112 A) rotatable about a first axis of rotation (C), a plurality of aerofoil blades rotatably mounted on the support structure (112 A) and free to rotate relative thereto about a second axes of rotation (Q) substantially parallel to and radially spaced from the first axis of rotation (C), and a means (162, 166, 168) for actuating the aerofoil blades (114) between first (114 A) and second (114 B) reflexed camber aerofoil section conditions such that the aerofoil blades (114) are freely rotatable to automatically set an angle of attack relative to a fluid flow direction (D) thereby to generate a lift force thereover and transmitting a torque to the support structure (112 A) to drive it through a repeating 360 degree rotary cycle.

An ocean power plant for converting slow water flow energy with a turbine comprising at least one endless rotation chain (4) with a plurality of plate holders (2) along the rotation chain where the plate holder comprises at least one plate (1) attached in each plate holder, further, the rotation chain running in an extended lane around and engaging at least one drive wheel (5) in the one end arch of the web tiltably attached to the plate holder to alternate between open position with the primary flow direction of the water flow, and closed position towards the flow direction, and the drive wheel has a turbine shaft (7) coupled to a generator device (G), an electrical generator or a converter of the rotational energy to hydraulics or other type of mechanical or potential energy, for the utilization of the rotational energy, furthermore the path of the rotary chain (4) is tilted relative to the main flow direction of the water flow, all arranged in a fully or partially submersible support structure (100).

A vertical axis wind turbine includes: a central axis that extends in a substantially vertical direction; a plurality of configurable airfoils disposed about the central axis, the plurality of configurable airfoils physically coupled to rotate together about the central axis; an angle adjustment mechanism configured to adjust an angle formed between a configurable airfoil and a radius that extends from the central axis as the configurable airfoil rotates about the central axis; and a profile adjustment mechanism that is configured to adjust a profile of the configurable airfoil as the configurable airfoil rotates about the central axis.

A vertical wind turbine with a plurality of vertical blades, which are each fastened to a respective vertical blade axis, such that they are pivotable around a respective blade rotation axis (C.sub.7) independently of one another, and are supported rotatable on a common circular path (K) around a vertical rotor rotation axis (C.sub.2), and a method for operating the vertical wind turbine, wherein pitch angles (?) of vertical blades of the vertical wind turbine, which are driven around a respective vertical blade axis, are predetermined. The pitch angle (?), at least in a partial load mode of the vertical wind turbine (1), is controlled such that the blades (7) rotate with an essentially constant tip speed ratio (?).

This invention relates to an improved vertical axis water turbine assembly (2) for generating rotary power from fluid flow, the water turbine assembly (2) having active blade pitch control. The water turbine assembly (2) comprises a plurality of vertical blades (20) disposed about a vertical assembly axis, each vertical blade (20) having a vertical blade axis and being adapted for movement about said vertical blade axis. The water turbine assembly (2) further includes guide means to control the movement of each of the plurality of vertical blades (20) as the water turbine assembly (2) rotates.