Abstract
To study seakeeping,a number of analytical tools have been developed;the most popular of which is the two-dimensional strip theory.Due to the slenderness as umption inherent in the theory,doubts arise on the validity of the application of such method to small boats particulary those in with low length to breadth ratio and shallow-draught.This paper presents the results of a theoretical investigation into the validity of strip theory for shallow-draught fishing boat.Response amplitude operators of a series of fishing boats having varying length to breadth ratio were computed using computer programs based on a two-dimensional strip theory and a three dimensional method. The comparison of the two sets of result indicates that the strip theory is reasonably robust particularly at low forward speeds.
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