Contrarotating Propeller Propulsion— A State-of-the-Art Report

This report presents a synthesis of existing knowledge, albeit limited, on CRP as applicable to merchant ship propulsion. It presents propulsive performance data for two types of ships, tankers and containerships, based on model tests, and discusses briefly the stopping, cavitation, and propeller-induced vibration problems of CRP. From the analysis it appears that the greatest potential for employment of such a propulsive device, offering significant reductions in installed shp, is on high-powered, fine-formed ships for which the only current alternative is a twin-screw installation.