Abstract
In the present paper, hydrodynamic behavior and bottom wetted surfaces of two-stepped planing hull are investigated by conducting towing tank tests. To this accomplishment, hydrodynamic resistance, reattachment length, trim angle, and bottom wetted surfaces are determined under different geometric variables of the two transverse steps and planing hull speeds. Qualitative investigation is also conducted on the forebody and aftbody wetted surfaces. Based on the obtained experimental data, lower hydrodynamic resistance is achieved by decreasing the aft step height at Fr∇ < 2.12, while, greater aft step height is resulted to lower total resistance under Fr∇ > 2.12. Reattachment length after the aft step is increased by an enhancement in aft step height and the longitudinal position of the aft step from transom. Moreover, aftbody wetted area after the aft step and total wetted areas are decreased by increasing the aft step height and decreasing the position of the aft step from transom. Also, an algorithm is suggested to calculate the forebody and aftbody wetted areas of two-stepped planing hulls.
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