Abstract: A hydrofoil strut assembly for a hydrofoil ship. The assembly has two major parts, the first part serves as a strut and is mounted at one end to the ship's hull foundation and carries a hydrofoil at the other end; the second part serves as a rudder, completely envelopes the first part and is rotationally mounted thereabout. The rotational mounting is provided by an upper bearing and a lower bearing. The upper bearing connects the rudder to the strut so that all loads are transferred via the strut to the hull. The lower bearing aligns the rudder about the strut next to the hydrofoil and carries loads to the first part or strut structure.