Abstract
Japan Railway Construction, Transport and Technology Agency (JRTT) has developed three types of SES for domestic coastal ships and promoted their wide use under the support of the Ministry of Land, Infrastructure, Transport and Tourism. These three types of SES, the Line Shaft CRP type, the Tandem Hybrid type and the Twin POD type were developed in cooperation with shipbuilding companies and marine equipment manufacturing companies. In total, 17 SES type ships have been delivered and currently three more SES ships are under construction. JRTT, research organizations and engineering and manufacturing companies are now jointly promoting the development project of Twin-propeller type SES as a new type of SES in addition to the three existing SES. Twin-propeller type SES is expected to give higher performance and lower building costs in comparison with the other SES and all other similar type of ships.
