The steady state conditions of a running model, in general, are always required in ship model tests at an ice tank to obtain average resistance and propulsion performance of a ship. However, model test measurements at an ice tank would often be carried out in unsteady state conditions of a running model, probably due to the limitation of the tank length and cost effectiveness in conducting the tests. In this paper some comments were made for the time and distance constants in self-propulsion tests at an ice tank, where a ship model runs after a towing carriage which runs at a steady speed and its yaw and sway motions of the model are confined by a guiding device.

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