Development of an Experimental Method to Assess the Performance of a High Speed Craft (The 2nd Report) : Hydrodynamic Forces Acting on Series Models Running with High Speed

Abstract

In the 1st report, the authors reported the development of an experimental system to measure hydrodynamic forces acting on fully captive models of planing craft at high speed (maximun speed=15m/s). Following this report, three-component hydrodynamic forces acting on series models towed by the system are measured to know fundmental characteristics of them with high speed up to Fn=6.0. It is shown that the residual resistance coefficient in terms of the displacement is not so sensitive to the hull form in very high speed. A simulation of the attitude and resistance of a craft using a database of measured hydrodynamic forces is also carried out to be compared with experimental results of a conventional resistance test. The comparison shows that the simulation results are in fairly good agreement with the experimental results at high speed.