A horsepower curve obtained by the model tests in calm water is shown in Figure B-22. This figure shows that the deep-draft ship in the full load conditions can manage a speed of 17 knots at normal output (21,740 PS) and 17.45 knots at maximum output (24,160PS). If a sea margin of 15% is added to normal output, however, the ship's speed drops to 16.4 knots. The power specification was then reset to normal output of 25,000HP and maximum output to 28,000HP.
Thrust increase in waves was deduced from the self-propulsion tests in regular waves (Figure B-23) and compared with the test results in Phase I. Although no data directly compares the deep-draft ship with hull form D, on which the deep-draft ship's bow was based, the present ship had the same level of thrust increase in waves as bow C, which had the lowest thrust increase among the three bow designs A, B and C in Phase I. These results were at least as good as the existing test results for ordinary bulk carriers.
