Abstract: Various embodiments of an apparatus and method for extracting useful work from a fluid stream are disclosed. Some embodiments comprise balanced hydrofoils comprising upper and lower semifoils joined by a member. Some embodiments comprise an array of removable hydrofoil modules wherein each module is adapted to provide an independent power contribution to an overall system, depending on speed of the fluid stream in the vicinity of the module, and each module is further adapted to provide its power contribution at a substantially consistent pressure to an array-wide high pressure fluid circuit. These and other embodiments are further disclosed herein.

Abstract: Various embodiments of an apparatus and method for extracting useful work from a fluid stream are disclosed. Some embodiments comprise balanced hydrofoils comprising upper and lower semifoils joined by a member. Some embodiments comprise an array of removable hydrofoil modules wherein each module is adapted to provide an independent power contribution to an overall system, depending on speed of the fluid stream in the vicinity of the module, and each module is further adapted to provide its power contribution at a substantially consistent pressure to an array-wide high pressure fluid circuit. These and other embodiments are further disclosed herein.

Abstract: Method and apparatus for converting the kinetic energy of a moving fluid stream into useful work by using a parallel cascade of aerofoils or hydrofoils positioned therein. The foils may be provided with at least two degrees of freedom and adjacent foils move in antiphase. The foils are subjected to resonant oscillations, known as flutter, induced by the fluid flow. Profiled inflow and outflow ducts may be positioned upstream and downstream, and the apparatus may be enclosed in a profiled duct, to increase efficiency by altering the fluid velocity and pressure. The foils are cantilevered, supported by vertical rods but are otherwise unattached. A cascade comprised of independent foil modules, each including a foil, a power conversion module and a motion control module, may be programmed to (1) receive energy from a fluid stream to generate power, or (2) transfer energy into a fluid stream to create propulsion or pumping.