In order that in a test on a free running model ship, in which steering force has a dominant influence, auxiliary thrust is set such that steering effectivenesses of the model ship and an actual ship are similar, an auxiliary thrust application means for applying auxiliary thrust to a model ship is controlled according to the calculation result of the auxiliary thrust calculated on the basis of the ship speed of the model ship such that the similarity of steering effectiveness is ensured to thereby apply the auxiliary thrust for ensuing the similarity of the steering effectiveness to the model ship.
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