This paper reports on a numerical study to obtain the full-scale drag force for large catamarans of 110 m to 190 m in length at medium speeds of Froude numbers between 0.25 and 0.49, which comprises vessel speeds from 16 to 41 knots. The paper concludes with appropriate values of slenderness ratios and transom immersion for the lowest total resistance at different Froude numbers, and appropriate hull lengths to achieve highest possible fuel efficiency for different drafts at speeds between 24 and 33 knots. These slenderness ratios, for lowest drag force, were determined at different Froude numbers of 0.25, 0.37 and 0.45.

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