Figure C-13 General arrangement and rough body plan of the 40,000DWT icebreaking bulk/container ship (40BC)
50,000DWT icebreaking bulk carrier (50BC)
This design study was carried out by the SOF as JANSROP to improve capabilities of the vessel to be employed in the NSR, particularly from economic viewpoints. During fiscal years 1993 to 1995 the JANSROP focused on creating the best possible ship with the requirements of a draft of 8m and displacement of 27,000t. As the first step, combinations of three typical bows with two stern forms were examined and a series of model tests were conducted in ice tanks and conventional towing tanks. Based on the results of those tests, in 1997 a 50,000DWT icebreaking bulk carrier was developed, with draft expanded to 12.5m for operation in the northerly route. Based on the tank test results, a new bow, labeled bow D was adopted, combined the advantages of bow A, which provided excellent performance in calm water, and the spoon bow B, which delivered superior icebreaking performance. The stern form d was based on stern b but improved with the adoption of more inclined flare for better turning ability (Figure 4.1-17). By inference from the test results, the 50BC will be capable of speeds of 3 knots in level ice 1.2m thick. Given a sea margin of 15%, it will attain to normal speeds of 17 knots in calm water. Whereas the focus of the 40,000DWT icebreaking bulk/container carrier was its icebreaking capability, the emphasis in the 50BC is performance on calm water; the engine output was determined mainly by the power requirements in calm water. The propulsion power is provided by a fixed-pitch propeller connected directly with the main engine. Figure C-14 shows the general layout of the 50BC.
