Marine power plant assembly

A marine plant assembly comprising:

• a buoyancy vessel;
• a plant operating unit attached to the buoyancy vessel in such away that the operating unit is at least partially submerged during operation;
• at least one link element providing an inclined hinged connection between the operating unit and the buoyancy vessel, thereby to allow movement of the operating unit from its submerged operating position to above the water level and adjacent the buoyancy vessel by said link element rotating about an inlined axis into a position substantially parallel to the buoyancy vessel;
• wherein the hinge includes two pairs of cylindrical bearings aligned on a common inclined axis and being able to rotate relative to one another about the common axis, a first cylindrical bearing of each pair being attached secured to a connection plate which in turn is secured to the link member, and the second of each pair being indirectly secured to the buoyancy vessel;
• wherein the second bearing of one pair is secured to a mounting plate which in turn is secured to the buoyancy vessel and the second bearing of the other pair is secured to a support structure which in turn is secured to the buoyancy vessel;
• wherein each air of cylindrical bearings has a first central shaft extending therethrough, the shaft having a rotation transmitting device secured thereto to rotate the shaft about the common axis independent of the bearings.