Abstract
Recent ship is usually equipped with a mariner rudder, which consists of horn and movable part. In the numerical modeling of the mariner rudder, they substitute the equivalent rudder having the same height and side ares as the movable part. In order to check the validity for it, we measured the open-water characteristics (normal force and chordwise force) of the mariner rudder, the equivalent rudder and the trapezoidal rudder which is unified one of the horn and the movable part. Through comparisons of the characteristics among the three kinds of rudders, we confirm the reasonableness of that modeling. Moreover, we clarify the effect of gap between the horn and the movable part on the open-water characteristics.
