A program of towing tank tests intended to cover about two years of activity is presented, and it is estimated that, in this time, four ship models can be tested for behavior in waves and the results properly analyzed. a comparison of the model test data of the parent and lengthened models will indicate the effect of the displacement-length ratio on ship behavior, and will serve to check the indications of Ref. 1 in this respect. In addition, a comparison of the performance of the lengthened models with that of other models of similar slenderness tested concurrently on other type of sections used in trawlers and small boats but which are unusual for conventional large ships. In the light of the theory of ship motions, these differences of section shape are significant.
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