A Design Procedure for the Improvement of Stern Form

Abstract

It is well known that the stern form plays an important role in the propulsive performance and the vibration problems induced by a propeller. This paper presents a design procedure based on the theoretical calculations to improve the stern form. The procedure is composed of the potential calculation, the boundary layer calculation and the thrust deduction calculation, which were already published. Through these calculations, the viscous resistance, the tendency of the wake pattern and the thrust deduction factor are predicted respectively to judge the total performance of the ship. Firstly, the accuracy of each calculation method is investigated to compare the predicted results with those of experiments for three models with different sterns and same forebody. Next, an example is shown to apply the design procedure to improve the stern form together with the confirmation test results. As a result of examination, it is found that the design procedure has a fairly good accuracy and is useful for the improvement of the stern form at initial design stage.