Abstract
The selection of the hull shape below the waterline becomes very important to improve performance and minimize emission during the design stage of the fast boat hull. To understand the performance comparison between the monohull and twin-hull of the same length and width, an analysis was carried out on an 8 m fiberglass ship with Maxsurf. Performance analysis was carried out with Hydromax for hydrostatic performance and ship stability and Hullspeed to analyze the performance of ship resistance and power. Hydrostatic Wetted Surface Area and transverse metacenter radius for the monohull were 13.883 m2 and 1.486 m, while a catamaran shows 12% to 24% higher WSA and 2% to 3% higher BMt compared to a monohull. The resistance and power of the ship at 40 knots for monohull were 24267.07 N and 1116.09 HP. In contrast, the catamaran shows up to 74% increase. Stability arm and radius of gyration show as follow: 0.297 m and 0.631 m for a monohull, while a catamaran shows up to 140% higher max GZ and 222% GMt. The results of this study can be used as a reference for determining the use of a monohull or catamaran hull in the early stages of a fast boat design.
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