NOVELTY - The OWSC (300) has a telescoping paddle (302) that is exposed to waves. The paddle is operable to rotate a hinge (3) that is connected to one edge of the paddle to a platform (1). The paddle has two parallel, contiguous paddle layers (9,10) whose overlap is controlled by a drive mechanism (11) capable of varying the overlap of the layers. The hydraulic power take-off subsystems (4,8) convert rotation of paddle about the hinge by waves into useful form of energy. A transmission subsystem (5) transports the useful energy to the shore of the water portion.    USE - OWSC for converting energy carried by water waves e.g. ocean waves into useful energy.    ADVANTAGE - The controlled variation of the paddle area reduces the undesirable variation in the energy captured and converted by varying continuously when needed. The OWSC is sited at water depths that are sufficient to avoid the breaking of waves. The strong sensitivity of energy conversion to paddle-area enables the effective control of the tide-driven variations. The effective surface area of the paddle exposed to the waves is increased, when the overlap of the paddle layers is small. Such controlled variations of the paddle area provide an effective method of managing the output of the OWSC, and reduce the output variations due to the variations in the input wave energy due to factors such as tide and normal fluctuations in the average wave height. The paddle layers include an opening in a section of the paddle layer so as to avoid the interference of the paddle extension motion and the hydraulic power take-off subsystem.    DETAILED DESCRIPTION - An INDEPENDENT CLAIM is included for method of reducing variation of energy converted by hinge-mounted surge-type wave-energy-conversion device.    DESCRIPTION OF DRAWING(S) - The drawing shows the perspective view of an oscillating wave surge converter.    Platform (1)    Hinge (3)    Power take-off subsystems (4,8)    Transmission subsystem (5)    Hydraulic paddle layers (9,10)    Drive mechanism (11)    OWSC (300)    Telescoping paddle (302)