The specifications of the Semi-balanced rudder and the rudder flap are each 0,000 × 0,000 mm and 0,000 × 0,000 mm as shown in Table 0, the rudder body plan is shown in Fig. 0 and Fig. Equal to 0. The loading condition at the time of testing assisted state it indicates line to 0,000 tons coming, the load state, when although the test is adjusted to 00,000 tons, zig-zag due to the test and stops the performance tests of experimental Marine chamber line difficulty only in full load condition It was, was subjected to both the chair structure iksu shipbuilding test light load state and a load state for