Investigating the Performance Characteristics of a Semi-Planing Ship Hull at High Speed

Abstract

Nowadays, the monohull and catamaran design as the high-speed vessel (HSV) become the convenient ships in sailing for the use of civilians, cars, buses, large trucks, and freight. However, some accidents by this kind ship due to its performances at high speed still occurred and required serious attention. The resistance and stability of a semi-planing hull must be reasonably considered because sometimes these are contradictory in making decisions for proper design. Therefore, this study has investigated the performance characteristics of a semi-planing ship hull at high speed. The semi-planing hull was modeled into three trim by stern conditions. The trim by stern of the semi-planing hull increases air cavity length and effects on resistance reduction. The decreased resistance is significant in FnV > 1.5 and the resistance reduction was averaged 34%. The powering requirement of the semi-planing hull would reduce due to trim by stern to then shifts on higher FnV. On the other hand, the stability range of semi-planing hull for all trim conditions is reduced due to the increase of trim by stern. Also, the maximum righting arm (GZ) shifts due to trim by stern as well where the increase of maximum GZ was averaged 3.72%. The GM decreases in increasing the angle of stern trim averaged 9.12%.

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