(ZA9208008-A)      The wave energy collector structure towable to a marine site is anchored by sediment (237) pumped from the sea bed (215) into the base (221) of the structure. The sediment may be stabilised. A three cell sphere tetrahedron collector has one or more openings for the ingress of waves.    To optimise air flow, the upper canopy has radial dividers whose lower edges extend below the water line. Ducts convey air to ensure constant turn direction of a rotor which extracts available power efficiently using pref. 9 to 15 rotor blades. These are catenary shaped to balance centrifugal and blade tension forces.    ADVANTAGE -   Efficient anchoring and wave energy extraction from about 10 fathoms deep.    .D    (JP6506513-W)      The wave energy collector structure towable to a marine site is anchored by sediment (237) pumped from the sea bed (215) into the base (221) of the structure. The sediment may be stabilised. A three cell sphere tetrahedron collector has one or more openings for the ingress of waves.    To optimise air flow, the upper canopy has radial dividers whose lower edges extend below the water line. Ducts convey air to ensure constant turn direction of a rotor which extracts available power efficiently using pref. 9 to 15 rotor blades. These are catenary shaped to balance centrifugal and blade tension forces.    ADVANTAGE -   Efficient anchoring and wave energy extraction from about 10 fathoms deep.    (EP580688-B1)      The wave energy collector structure towable to a marine site is anchored by sediment (237) pumped from the sea bed (215) into the base (221) of the structure. The sediment may be stabilised. A three cell sphere tetrahedron collector has one or more openings for the ingress of waves.    To optimise air flow, the upper canopy has radial dividers whose lower edges extend below the water line. Ducts convey air to ensure constant turn direction of a rotor which extracts available power efficiently using pref. 9 to 15 rotor blades. These are catenary shaped to balance centrifugal and blade tension forces.    ADVANTAGE -   Efficient anchoring and wave energy extraction from about 10 fathoms deep.