The propulsion performance in ice was tested in the multi-year floe in the East Siberian Sea and the first-year ice in the Laptev Sea and Kara Sea.
Although the maximum continuous rating of the main engine installed in the Kandalaksha was 21,000HP, the measurements indicated that maximum horsepower under the most rigorous conditions of multi-year ice was 13,000HP, delivering speeds of 1-6 knots. The engine was originally designed for navigation through the year in the NSR and anchoring at Russian ports. However, the results of the experimental voyage suggest that for the purposes of NSR transit shipping, this rating was inappropriate-excessive for the summer and insufficient for winter navigation.
[8] The results of the propulsion performance tests were correlated with the ice numerals obtained from the ice observation results. In Figure 5.12, each ice numeral is correlated with ship speed. As expected, this correlation was positive: as the ice numeral decreases, so does the speed of the vessel, requiring greater output from the engine. Canadian ice numerals introduced into the regulations (CASPPR) was based on the operation experience that an average ship speed in statistics was 3 knots at the ice numeral of 0.
