Abstract
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 University of Technology, Iran. The second one is a scaled-down model of 18 m planing catamaran boat and the test was conducted at the towing tank of Krylov Shipbuilding Research Institute (KSRI), Russia. The experimental results show a remarkable drag reduction of up to 15% for mono-hull model and up to 12% for catamaran model over the wide speed range of the models.
Highlights
Interceptors have been used for trim and ride control of planing and semi-planing boats since the 1970s and the application of these devices has steadily increased over the years
The aim of the present study is to provide a method to evaluate the effect of interceptors on high speed planing mono-hull and catamaran and fill the knowledge gap that currently exists, by carrying out the tank test of the scaled-down planing mono-hull and catamaran models with interceptors at full planing speed
The following conclusions can be obtained from the modeltest results: 1. Based on the present analysis and achieved results, it is proved that the interceptors can be applied as a highly effective device to reduce the resistance of high- speed planing crafts, and in addition their performance can be improved by appropriate varying, in an integrated manner, Lcg and size of the interceptors
Summary
Interceptors have been used for trim and ride control of planing and semi-planing boats since the 1970s and the application of these devices has steadily increased over the years. The most common application of interceptors is to serve as a trim control device that can help to reduce the overall resistance of planing vessel. There is another way to decrease the resistance of a planing vessel by means of interceptors, i.e. through installing the interceptor amidships. This results in the reduction of the wetted area, both by increasing the dynamic lift and creating an air cavity behind the interceptors. The present study aims at improving the understanding of the impact of interceptors on hull resistance by reviewing the published literature sources, examining the impact of the interceptors on hydrodynamic quality of planing mono-hull and catamaran through an experimental study, and to develop further insight into the procedures by which interceptors can cause reduction of resistance
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