A reciprocal motion wind energy harvesting device has a first vane carrier assembly and a second vane carrier assembly, which are supported by and rotate about a central shaft. The vane carrier assemblies support pluralities of vanes to receive wind force. The vanes are configured to be rotatable in order to produce opposing and reciprocating motion of the lever arm assemblies. The lever arm assemblies are operatively connected to a generator in order to convert the wind force received by the vanes into energy.

A vertical axis windmill system for interacting with ground level winds has a plurality of vertical windmill units. Each vertical windmill unit includes a rotation unit and outer rings. The rings are secured to the vertical support columns. The rotation unit has a plurality of blades equally spaced around a rotatable center shaft. Each blade has a plate extending from the central shaft to an outer end. The plate has a curvature from an upper edge to the lower edge. Each of the blades has a plurality of openings. A plurality of flaps are pivotably mounted to the blade to move from an open position allowing air through the plurality of openings to a closed position limiting air through the plurality of openings. The system has a generator for converting the rotation motion of the rotatable central shaft to electrical energy.

A vertical axis windmill turbine includes a support structure for supporting the vertical axis windmill turbine above ground level. At least one rotor rotates upon the support structure. The at least one rotor comprises a horizontal structure having a rotational axis perpendicular to the ground level. A plurality of blades positioned within each of the at least one rotor cause the at least one rotor to rotate on the support structure responsive to wind force. A plurality of vanes are located on each of the plurality of blades and rotate between an open position to limit drag on the at least one rotor and a closed position that provides a rotational force to the at least one rotor. The plurality of vanes rotate between the open position and the closed position responsive to a wind force. A plurality of vane stops each associated with a vane of the plurality of vanes stops the rotation of the vane when the vane reaches the closed position. A vane control mechanism associated with each vane/vane stop lessens a force with which the vane impacts the vane stop when moving to the closed position.

Disclosed is a vertical axis wind turbine air concentration tower with reduced radar cross section. The air concentration tower has a polygonal outer perimeter, a pivot located at each vertex of the polygonal outer perimeter, and an inwardly-positioned rudder blade operatively connected at each pivot. Each inwardly positioned rudder blade has a first wind-neutral position, and is pivotable through a plurality of angles that adjust based on an incoming wind direction, such that the incoming wind is channeled to the vertical axis wind turbine, which is located approximately at a center area of the polygonal outer perimeter. A radar absorbent material is applied to the vertical axis wind turbine air concentration tower to reduce the radar cross section. The air concentration tower is designed to provide higher wind speed to the vertical axis wind turbine than the surrounding ambient air.

This disclosure provides a vertical-axis windmill including a rotating vertical shaft and at least one vane assembly mounted to the rotating vertical shaft. The vertical-axis windmill rotates around a vertical axis when wind impinges upon the vane assembly. During rotation, a planar sail of the vane assembly moves along an oscillatory arc of about 90°, with the planar sail assuming each of a vertical orientation and a horizontal orientation once during each 360° rotation of the vertical shaft. As described below, this configuration advantageously allows the windmill to be self-starting and suited for operation at low wind-speed.

Disclosed is an air concentration tower for a vertical axis wind turbine. The air concentration tower has a polygonal outer perimeter, a pivot located at each vertex of the polygonal outer perimeter, and an inwardly-positioned rudder blade operatively connected at each pivot. Each inwardly-positioned rudder blade has a first wind-neutral position, and is pivotable through a plurality of angles that adjust based on an incoming wind direction, such that the incoming wind is channeled to the vertical axis wind turbine, which is located approximately at a center area of the polygonal outer perimeter. The air concentration tower is designed to provide higher wind speed to the vertical axis wind turbine than the surrounding ambient air.

The Variable Tilting Blade Twin Turbine Wind Mill device is for capturing kinetic energy from the wind and is comprised of a shaft having a plurality of central hubs connectively attached, each central hub having a plurality of wind capture arms comprising a rotating wind capture blade having a capture surface and a slicing edge that are rotated by a rotating gear and drive gear combination connectively attached to said wind capture blades enabling a rotation of said wind capture blades wherein the wind capture blades are rotated between a blade-mode to capture the wind and a knife-mode to pass with less drag resistance through the air/wind thereby enabling an increase in the ability to capture more of the energy available in the wind stream.

In a rotating machine having a fluidic rotor, the rotor comprises at least one blade mounted on an arm rotating about a rotor shaft forming a main axis of the rotor, the rotor being kept by a supporting structure in an orientation such that said axis is substantially perpendicular to the direction of flow of the fluid, the blade being mounted so as to pivot about an axis of rotation of the blade parallel to the main axis. The machine comprises means for generating a relative oscillation movement of the blade with respect to the arm at the axis of rotation of the blade, in order in this way to vary the inclination of the blade during the rotation of the rotor. Said means comprise, at the arm end, a mechanism comprising a first rotating element (A; B) known as the drive element and a second rotating element (B; A) known as the driven element, the elements being mounted on mutually parallel axes of rotation and separated by an inter-axis distance, the orientation of the drive element being controlled depending on the orientation of the rotor shaft while the orientation of the driven element determines the orientation of the blade, one of the rotating elements comprising a finger (D) spaced apart from its axis of rotation and the other rotating element comprising a groove (C) which receives the finger and in which the finger can slide. Application notably to wind turbines, to marine turbines and to nautical and aircraft propellers.

A vertical axis windmill system for interacting with ground level winds has a plurality of vertical windmill units. Each vertical windmill unit includes a rotation unit and outer rings. The rings are secured to the vertical support columns. The rotation unit has a plurality of blades equally spaced around a rotatable center shaft. Each blade has a plate extending from the central shaft to an outer end. The plate has a curvature from an upper edge to the lower edge. Each of the blades has a plurality of openings. A plurality of flaps are pivotably mounted to the blade to move from an open position allowing air through the plurality of openings to a closed position limiting air through the plurality of openings. The system has a generator for converting the rotation motion of the rotatable central shaft to electrical energy.

Pocket and cup sails formed from flexible materials, especially such sails formed with excess material, have spar like supports attached at their deepest point to maintain the depth of the said sails when the wind fills them so that the sails expand to maximize resistance to the wind coming into the openings of the sails and so that the sails deflate when the wind is coming from the back of the sails to minimize resistance to the wind, the said sails being attached to rotor arms on rotary devices to provide torque, the torque being used to rotate decorative structures including the sails themselves, generate electricity, bring airplane tires up to speed before landing, and/or measure wind speed, and sails optionally having cuffs on the inside to help the sails inflate and/or maintain inflation by minimizing spillage of air.