Abstract: A hydrokinetic energy conversion system (1) comprising a turbine device (2) comprising a rotor (3) displaying a rotational axis (O), which turbine device is arranged to operate with the rotational axis in an inclined orientation vis-à-vis an incoming body of water (W), and which rotor comprises a blade (10) which is arranged to interact with the incoming body of water such that rotational energy is imparted to the rotor. The blade comprises a first, convex surface (12), a second, concave surface (13) and a free, distal edge (E) where the first surface and the second surface meet. The curvature of the second surface, when viewed in a plane orthogonal to the rotational axis, is such that a maximum depth (Dmax) of the second surface, when measured from a straight line intersecting the rotational axis and the distal edge, is at least 35% of the distance between the rotational axis and the distal edge.

Abstract: An arrangement for extracting energy from flowing liquid, such as tidal flows, oceanic currents and water flowing in rivers. The arrangement comprises a support device (12) and a turbine device (1) which is pivotally connected to the support device (12) about a substantially horizontal axis (18). The turbine device includes at least one helical turbine (2; 4), each having an axle connected to an energy converter (22; 24). The turbine device (1) has a proximate end and a distal end, the proximate end being pivotally connected to the support device (12), and the distal end being freely movable in a substantially vertical, circular path in the flowing liquid. This enables the turbine device, in use, to adjust to an operational angle with respect to a horizontal plane. The arrangement is characterized in that the distal end of the turbine device (1) is provided with at least one transverse bar (7), stabilizing the operational angle of the turbine device (1).

Abstract: An arrangement for extracting energy from flowing liquid, such as tidal flows, oceanic currents and water flowing in rivers. The arrangement comprises a support device (12) and a turbine device (1) which is pivotally connected to the support device (12) about a substantially horizontal axis (18). The turbine device includes at least one helical turbine (2; 4), each having an axle connected to an energy converter (22; 24). The turbine device (1) has a proximate end and a distal end, the proximate end being pivotally connected to the support device (12), and the distal end being freely movable in a substantially vertical, circular path in the flowing liquid. This enables the turbine device, in use, to adjust to an operational angle with respect to a horizontal plane. The arrangement is characterized in that the distal end of the turbine device (1) is provided with at least one transverse bar (7), stabilizing the operational angle of the turbine device (1).