Measurements of Hydrodynamic Forces acting on Planing Hull at High-Speed by Planar Motion Mechanism Test

Abstract

In the present study, six-component hydrodynamic forces acting on the 1/4 scale model of a planing craft by planar motion mechanism test at high advanced speed are measured for various planar motions and running attitudes, rise and trim angle. The measured data show that the first order components with the same frequency as that of forced motion are significantly larger than high order comjconents. This means that the hydrodynamic forces model can be expressed by only the first order components of motion's velocity and acceleration. The effect of running attitudes on the hydrodynamic coefficients is significant and it is necessary for maneuverability of planing craft to take into account this effect.