Effect of Angle Change in the Aft-Wise Transverse Step on the Hydrodynamic Performance of Planing Hulls

Abstract

Demand for faster vessels continues to grow, various high speed vessels have been designed and constructed for military, recreational, and passenger use. Planing vessels, specifically engineered for high-speed travel, require optimization to improve their hydrodynamic performance and stability during design. Reducing resistance and improving longitudinal stability are key challenges in the design of high-speed vessels. Various methods are employed to overcome these challenges, with the use of a transverse step being one of the most common approaches. This study explores the effect of changing the angle of the aft-wise step and incorporates these changes into existing analytical formulas, resulting in new formulas specifically for high-speed vessels equipped with aft-wise steps. This research investigates how the angle of the transverse step affects the hydrodynamic performance and longitudinal stability of high-speed vessels. Based on the results, analytical formulas have been developed to calculate the wetted surface parameters of vessels equipped with an aft-wise transverse step. The study used experimental methods to analyze the vessel’s behavior with six different aft-wise transverse step angles of 0°, 9°, 11°, 13°, 15°, and 17° at three speeds of 8, 10, and 12 m/s. In the experimental tests, the hydrodynamic components of resistance, trim angle, and wetted surface of the vessel were measured. Results indicate that creating an angle in the transverse step substantially improves the hydrodynamic components and longitudinal stability of the vessel. At the optimal angle, the resistance and trim angle of the vessel were reduced by 7.8% and 12.8%, respectively, compared to the base vessel. Additionally, the existing analytical methods for calculating the wetted surface area are more accurate than similar methods

Keywords

High speed vessel / Experimental method / Aft-wise transverse step / Hydrodynamic components / Analytical formulas

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