Oscillating Hydrofoil

Oscillating hydrofoils operate via passive or active manipulation of one or more foils to induce hydrodynamic lift and drag forces due to pressure differences on the foils. They may be oriented horizontally or vertically, though like axial flow turbines, must face the direction of flow for maximum energy extraction. Linear motion of the foils may be converted to rotary motion for electricity generation, or linear generators may be used.

Photo: Engineering Business Ltd