More preferably, a surface of the hydrofoil extending between its leading and trailing edges is generally lunate shaped. More preferably, a surface of the aerofoil extending between its leading and trailing edges is generally lunate shaped. Preferably, the controller is adapted to control movement of the lift generating element s into a position closer to parallel to a vertical plane, which plane is parallel to the direction of the fluid flow passing the member, if the value sensed by the sensor is indicative of fluid forces that may damage the device. Depending on the value indicated by the sensor, the lift generating element may be moved into and maintained in a streamlined configuration substantially parallel with said plane. Preferably, said member is adapted to move relative to said base towards a position in 5 which said longitudinal axis generally aligns with a vertical plane parallel to the direction of the fluid flow passing the member.
The hydrofoil is preferably formed from a composite material.
Preferably, the controller is adapted to control movement of the lift generating element into a position closer to parallel to said vertical plane if the value sensed by the sensor is indicative of fluid forces that may damage the device. More preferably, the portions adapted to flex are upper and/or lower portions of the hydrofoil. At least some portions of the aerofoil are preferably adapted to flex in response to fluid forces. The aerofoil is preferably formed from a composite material. The hydrofoil is preferably formed from a composite material. The second pivotal axis is preferably vertical and the hydrofoil is preferably adapted to generate a generally horizontal lift.
Also, instead of generating electricity, the io device may be fitted with a reciprocating pump to create a source of high pressure water for desalination or may be adapted for driving other external devices. The flows can be very low in some situations and extremely high in others. Ducts are provided in the tank and house high speed turbines for generating power in response to air flow generated by the changing pressure within the tank. Another disadvantage of the device disclosed in US 6,731,018 is that energy from the flow is transferred to the generators in an indirect manner, having to pass through multiple intermediate stages (water to hydrofoils, hydrofoils to tank motion, tank motion to air compression, air compression to flow across turbine), which together reduce the overall efficiency. Dolor de cuello y hombro lado derecho . Background of the Invention US 6,731,018 discloses a device for capturing energy from tidal flows and river currents.
A further disadvantage of the US 6,731,018 device is that the hydrofoil shapes disclosed are not generally efficient in unsteady oscillating flows. Another disadvantage of the device disclosed in US 6,731,018 is that the hydrofoils do not make optimal use of the fluid force imparted to them. Several hydrofoils are hingedly connected to the sides of the tank, each rotatable about a horizontal axis. The tank is driven in oscillatory vertical motion along the column by varying the angle of inclination of the hydrofoils with respect to the direction of water flow past the device. The longitudinal axis of the member is preferably substantially horizontal. The aerofoil is preferably pivotally connected to said member about a second pivotal axis. The base preferably includes a circular mounting flange, fixedly connected to the column, for attachment to the ground by a plurality of anchors. The present invention has been developed primarily for use in hydro-electricity generation, and will be described hereinafter with reference to this application.
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In a preferred form, the member is streamlined. The is hydrofoil is preferably pivotally connected to said member about a second pivotal axis. In a preferred form, a stator of said motor/generator is fixedly connected to said base at an underside of said motor/generator. In a preferred form, said member is pivotable through at least 180 degrees, and more preferably 360 degrees, about said first pivotal axis. In a preferred form, the column is generally cylindrical. The machine can preferably function both as a motor and as a generator.