Method for mounting ring-shaped construction on ship stern

摘要

A method for mounting a ring-shaped construction on a ship stern in front of a propeller which comprises fixing a plurality of pieces at a predetermined distance along a periphery of a ring-shaped construction, marking the points respectively on a plurality of said pieces which are located in a same distance from the center of said ring-shaped construction, and mounting said ring-shaped construction to said ship stern. In this process, centering so that the circular locus of the beam emitted from a projector being rotated around the rotating axis of a propeller passes over said marked points of a plurality of pieces fixed to said ring-shaped construction, the settling position of said ring-shaped construction is adjusted.