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In this paper relationships for resistance and trim of planing Catamarans in calm water are presented. This work is based on Savitsky empirical method for monohull planing crafts. According to the present method, a computer software is developed for calculation of resistance and trim of a Catamaran in different speeds. Moreover, the effects of different factors such as displacement, longitudinal center of gravity, deadrise angle, length to beam ratio, distance between demihulls are studied. The
investigation of these factors can be very
useful in preliminary design for designers and initial assessments of the craft