Resistance and Propulsion Characteristics of the Newly-Proposed Under-Keel-Stern Ship Mooel

Abstract

In this paper, the authors propose a new hull form named the Under-Keel-Stern (UKS) Ship, whose stern has the under-keel portion of bulbous stern shape. The reason to propose this form is as follows. Firstly it adds more wake at the lower portion of propeller disc, so that the wake distribution will be more uniform. It may also increase the so-called wake gain due to increased mean wake. It also provides more flexibility for design of stern form, so that it may become possible to design low wake and low resistance form at the hull portion near load water line. Model experiments are performed at the water circulating tank for obtaining the resistance, propulsion and wake characteristics by using a normal-shaped tanker model and a newly proposed Under-Keel-Stern model. Results show that the Under-Keel-Stern form seems to have promising features in propulsive characteristics.