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A series of tank tests for slamming was carried out in the seakeeping basin, making use of an elastic ship model. The flexural rigidity of the model were reduced according to the laws of similitude. In this paper, foamed vinyl chloride was chosen for the material of the model. This material, which has relatively low modulus of elasticity and large damping for vibrations, is one of the best candidates for clarifying the characteristics of whipping vibrations caused by respective slams. The experimental results are compared with the nonlinear theory proposed by the authors in the previous papers, which shows good agreements. 1.

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