An experimental study of interceptor’s effectiveness on hydrodynamic performance of high-speed planing crafts

Abstract

Trim control mechanisms such as interceptors and trim flaps have been widely used in recent years in highspeed crafts for ride and trim control. In spite of their extensive application, a few studies investigating the impact of interceptors on planing craft performance, have been published. In the present study, the impact of interceptors on planing crafts hydrodynamic quality is investigated through application of an experimental method. Two scaled-down models of high-speed planing mono-hull and catamaran are tested with and without interceptors in calm water at different heights of the interceptors to investigate the effect of interceptors on drag reduction of the models. The first one is a scaled-down model of 11 m planing mono-hull boat and the test was conducted at the towing tank of Sharif

Experimental Study of the Wedge Effects on the Performance of a Hard-chine Planing Craft in Calm Water

“…In the current paper, resistance of the planing hull is reduced by 6-15%, when wedge 1 is used, and it is reduced by 2-11%, when wedge 2 is used. In comparison with previous studies, it should be mentioned that Karimi et al [14] reported a reduction of 3.3 to 11%, when interceptors with height to length ratio of 0.4 is used. Also, the results of Karimi et al [14] showed that, resistance is reduced by 8-19%, when an interceptor with height to length ratio of 0.6 is used.…”

“…In comparison with previous studies, it should be mentioned that Karimi et al [14] reported a reduction of 3.3 to 11%, when interceptors with height to length ratio of 0.4 is used. Also, the results of Karimi et al [14] showed that, resistance is reduced by 8-19%, when an interceptor with height to length ratio of 0.6 is used. The results of the current study show that, the installed wedges yield promising results, especially in the case of wedge 1.…”

“…Future studies may focus on experimental works on the effect of a wedge on the vertical motion amplitudes and the bow acceleration in regular waves. [14] by adding data of current paper. [14] by adding data of current paper.…”

“…Unlike the previous studies in which Reynolds Number is mostly smaller than 10×10 9 , in the current paper, larger range of Reynolds number is considered. [14] by adding data of current paper.…”

Statistical Analysis of Wedge Effect on the Seakeeping of a Planing Hull in Irregular Waves at the Onset of the Planing Region

“…In order to select the wedge, boundary layer height and dynamic trim are considered. According to Karimi et al (2013), the wedges height should be at least half of the boundary layer height. In order to measure the absolute heave and pitch in irregular waves, calm water tests are necessary to extract the rise-up and trim.…”