Minimization of Resistance of the Planing Boat by Trim-tab

Hassan Ghassemi^1, , Hassan Bahrami¹, Alireza Vaezi¹ and Mohammad Aref Ghassemi¹

¹Department of Maritime Engineering, Amirkabir University of Technology, Tehran, Iran

Cite this paper:
Hassan Ghassemi, Hassan Bahrami, Alireza Vaezi and Mohammad Aref Ghassemi. Minimization of Resistance of the Planing Boat by Trim-tab. International Journal of Physics. 2019; 7(1):21-26. doi: 10.12691/ijp-7-1-4

Abstract

Trim-tab is a device for controlling the trim and improves the performance of the planing boat. It is installed at the stern of the hull to adjust the longitudinal center of pressure (LCP). This paper is presented to minimize the resistance of the planing boat using trim-tab. Savitsky’s method is employed to calculate the resistance. The chord of trim-tab is defined constant but the span is changed. The longitudinal center of gravity (LCG) is constant but LCP is varied at each speeds. By using the trim-tab, the LCP and LCG are adapted and the optimum trim angle and minimum resistance are calculated. The results of optimum trim angle, total resistance and angle of trim-tab at different speeds are presented and discussed.

Keywords:
trim-tab minimum resistance planing boat savitsky’s method

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