An oscillating fluid energy capturing assembly, including at least one hinged propeller assembly, each hinged propellor assembly of the at least one hinged propeller assembly including a driveshaft including a first end and a second end, a first plurality of blades pivotably connected to the first end, and a second plurality of blades pivotably connected to the second end.

This invention relates to a wave energy recovery apparatus with a power-take-off arrangement comprising at least a base, a reciprocating panel, two power-take-off (PTO) units with one or more generators to convert kinetic energy of waves or tidal currents to electricity, at least two gear transmissions operatively connected between the panel and the generators and at least two one-way clutch mechanisms to control the directions of rotation of the generators. The panel is arranged to rotate a half of the generators when rotating into one direction and another half of the generators when rotating into the opposite direction.

This invention relates to a wave energy recovery apparatus with a power-take-off arrangement comprising at least a base, a reciprocating panel, two power-take-off (PTO) units with one or more generators to convert kinetic energy of waves or tidal currents to electricity, at least two gear transmissions operatively connected between the panel and the generators and at least two one-way clutch mechanisms to control the directions of rotation of the generators. The panel is arranged to rotate a half of the generators when rotating into one direction and another half of the generators when rotating into the opposite direction.

This invention relates to a wave energy recovery apparatus with a power-take-off arrangement comprising at least a base, a reciprocating panel, two power-take-off (PTO) units with one or more generators to convert kinetic energy of waves or tidal currents to electricity, at least two gear transmissions operatively connected between the panel and the generators and at least two one-way clutch mechanisms to control the directions of rotation of the generators. The panel is arranged to rotate a half of the generators when rotating into one direction and another half of the generators when rotating into the opposite direction.

A wind turbine device may include four wings. A first wing may include a first leading edge and a first trailing edge, and a second wing may include a second leading edge a second trailing edge. The first and second leading edges may be positioned on opposite sides of the axis of rotation, the first and second trailing edges may be positioned on opposite sides of the axis of rotation, and the first and second leading edges may be positioned relatively further to the axis of rotation than the first and second trailing edges. A third wing may include a third leading edge and a third trailing edge, and a fourth wing may include a fourth leading edge and a fourth trailing edge. The third and fourth trailing edges may be each positioned proximate to the axis of rotation and positioned on opposite sides of the axis of rotation.

The present invention relates to a vertical wind turbine (1) with a plurality of vertical blades (7), which are each fastened to a respective vertical blade axis (26), are each such that they are motor-driven 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 to a method for operating the vertical wind turbine (1), wherein angular positions of vertical blades (7) of the vertical wind turbine (1), which are each driven around a respective vertical rotor blade axis (26), are predetermined. According to the invention, the vertical wind turbine (1) is operated in a particularly efficient and material-protecting way in that the angular positions of the blades (7) are continuously controlled through a direct drive of each of the blades (7) by means of a respective pitch motor (27) positioned concentrically to the blade axis (26).

A hydropower generator includes: a driving shaft installed along a path through which a fluid flows; a plurality of blade assemblies installed along a lengthwise direction of the driving shaft; a spinning supporter connected to rotatably support the driving shaft; a power generator receiving a spinning force of the driving shaft and generating electricity; and a flow pipeline internally provided with the driving shaft along a lengthwise direction thereof and formed with a channel through which a fluid flows.

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 present invention relates to a water turbine in which a unit pipe can be joined by an optional number and a rotating shaft integrated with a rotor can be joined by an optional number according to intended use or condition of use, and by which each rotor can be supported stably. A water turbine in which a rotor provided in a water conduit pipe is rotated by a water flow in the water conduit pipe and the rotation of the rotor is utilized as a motive power, wherein pluralities of the unit pipes constituting a part of the water conduit pipe are connected in order by interposing an end plate having a bearing and a water passing part between respective them, wherein pluralities of rotating shafts respectively integrated with the rotor are linearly connected by providing a connecting means between respective them while end portions opposing to each other of a pair of adjacent rotating shafts are brought into contact, wherein each of the rotating shafts is rotatably supported by respective pair of bearings arranged to neighbor each other such that at least one of the rotors is arranged between the respective pair of bearings, and thereby forming a water turbine unit.

A vertical wind turbine that includes a plurality of vertical vanes, each of which is secured to a respective vertical vane axis so as to be rotatable about a respective vane rotational axis independently of one another by a motor and which are mounted on a common circular path in a rotatable manner about a vertical rotor rotational axis. A method for operating a vertical wind turbine. Angular positions about a respective vertical vane axis are specified for driven vertical vanes of the vertical wind turbine. The vertical wind turbine is operated in a particularly efficient and material-preserving manner in that the angular positions of the vanes are permanently regulated by directly driving the vanes using a pitch motor arranged concentrically to the respective vane axis.