The development of icebreaking ships started systematically in late 1960ies. That time also it came quite common to also perform model tests in ice. Model tests are used to make comparisons with alternative designs. Full-scale tests are used for two main purposes; to verify the performance of a vessel built and to create correlation data base to be able better scale up model test results. One of the key issues is the guaranteed performance of a vessel which means that in the shipbuilding contract there is the clause containing for instance the icebreaking capability of the vessel. In uniform level ice it could be a speed and ice thickness. During the last 40 + years the full-scale onboard vessel tests by Aker Arctic and its predecessors; namely W& ärtsil& ä Ice Model Basin (WIMB), W& ärtsil& ä Arctic Research Centre (WARC) and Masa-Yards Arctic Research Centre (MARC), consist of a total of 96 different vessels tested on 140 occasions. These tests include in addition to vessel performance verification also measurements on propulsion loads and hull stress. In addition there have been numerous research projects and projects on vessel operations.

This paper will summarize and discuss the extent of work performed in full scale testing concentrating on vessel performance, what and how things have been done.

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