This paper aims to cost-effectively improve the energy efficiency of large vessels in shipping by the optimum design of propeller boss cap fins (PBCFs). First. a model propeller of the modern four-blade propeller in a Ro-Ro ship. with no boss cap fin in its original design. https://www.spidertattooz.com/Ruffino-Riserva-Ducale-Oro-Chianti-Classico-2019-750ml/