A hydrofoil simulator structure comprising a tank, in which a water current is generated, and a frame, which supports an elastic trampoline positioned above the water surface of the tank; the structure also comprising a series of elastic ropes associated with a trapeze harness worn by a user who stands on a board of a hydrofoil having wings immersed in water.

The invention relates to a surfing installation (10, 10A, 10B) for generating a surfable wave (60), comprising an inclined ramp (50) to the upper end (51) of which water flows via a water inlet (46), which water is accelerated on the ramp (50) to a first flow speed, the lower end (52) of the ramp (50) leading into a region (30) having a lower second flow speed relative to the first flow speed, and a standing wave, in the flow direction, forming in the region (30) as a result of the water flowing at the first, faster flow speed striking the water flowing at the second, lower flow speed. A further functional area for the surfing installation (10) for one or more surfers (80) is achieved, according to the invention, in that at least two walls (506, 508) that define at least one flow channel (504) are arranged in the region of the water inlet (46) and/or of the ramp (50), which walls are movable in rotation and/or in translation, transversely to the flow direction of the water, by means of at least one drive (5046), in order to generate at least one traveling wave (60) that travels transversely to the flow direction.

Repulsive force created by actuated permanent magnets is used to levitate and transport heavy loads. A bed of permanent magnets is selectively actuated to levitate an array of magnets positioned above the bed, such that the magnets in the levitated array are opposed to the actuated magnets, and of the same magnetic pole, thereby creating a repulsive force. The actuated magnets are vertically offset from magnets in the bed of permanent magnets that have not been raised, thereby imparting maximum levitation forces to the magnets in the levitated array. These systems can levitate and transport objects over level or sloped surfaces, in a straight path or along curves and corners. A bed of magnets can be attached to the floor, or to a set of moving decks that rearrange themselves in a desired path. Our systems can simulate walking or running, similar to a treadmill or virtual gaming platform.

Devices and methods for generating surfable waves in a pool. Waves are generated by removing support, at a progression of areas at the bottom of the pool, for the water in the pool and causing rapid downflow at a progression of areas at the bottom of the pool.

The invention relates to a hydraulic pump (10) comprising a pump shaft (52) and a casing (46) delimiting a liquid circulation duct (44) in which the cross-section of the outlet orifice (12) is flattened and is oriented such that the liquid outlet direction (14) is inclined from a longitudinal axis (22) of the pump shaft passing through the casing, the casing comprising a first segment (100a) in which the inside surface (102a) has a circular cross-section centred on said longitudinal axis (22) and surrounding a pump impeller (60) supported on the pump shaft (52). According to the invention, the first segment (100a) has a downstream end starting from which the cross-section of the casing inside surface becomes flattened.

A wave generating apparatus (100) for generating at least one wave in a surface of a body of water (102) has at least one wave generating object (12, 150) with at least one wave generating surface (13, 152), drive means (108, 110) for causing the wave generating object to oscillate along a path (106), with the wave generating object in contact with the body of water for at least some of the time. When there is a single wave generating object (12, 150), the wave extends away from the wave generating object and when there are multiple wave generating objects (12, 150), the wave generating objects (12, 150) and wave generating surfaces (13, 152) are configured such that substantially all of any waves generated extend away from the wave generating objects.

A method and apparatus for generating a wave in a body of water may include altering a flow of water as it is urged through an inlet, contoured passage, and outlet. For example, a primary flow of water may be altered so that one or more secondary flows are created at angles to the direction of primary flow.

Described is a sand training bag for sand training. It includes a set of bag walls which includes a training surface wall and a perimeter wall. The sand training bag is transitionable between a closed bag configuration in which the set of bag walls defines a bag chamber to an open pit configuration in which the set of bag walls forms a sand training pit with the training surface wall forming a floor of the sand training pit and the perimeter wall forming a perimeter side wall of the sand training pit, the sand training pit being provided to receive and hold a quantity of sand.

Devices and methods for generating surfable waves in a pool. Waves are generated by removing support, at a progression of areas at the bottom of the pool, for the water in the pool and causing rapid downflow at a progression of areas at the bottom of the pool.

A current control system for a wave pool comprising: an array of flow meters disposed within said wave pool; a complimentary array of current generators disposed within said wave pool; and a processor operable to receive data relating to currents within said wave pool from said array of flow meters, wherein said processor is operable to control currents generated by said array of current generators in response to said data relating to currents within said wave pool received from said array of flow meters.