Study on Wavemaking Resistance of Catamaran and Trimaran

Abstract

In this paper we present experimental data of wavemaking resistance of catamaran and trimaran. We adopt the Wigley catamaran and trimaran for the present experiment. Main hull is a usual Wigley model and the outrigger is a half Wigley model which is a model halved at the center plane. In the experilment at the towing tank of Kyushu University, we measured total resistance of each hull at a fixed lateral distance by changing the stagger and Froude number. From measured total resistance, we obtain the residuary resistance coefficient. Numerical calculation based on Rankine source method is also performed. By experiment and calculation, we show the usefulness of the numerical calculation method and make clear the effect of stagger on the wavemaking resistance of catamarau and trimaran.