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Bilge keel design for the traditional fishing boats of Indonesia’s East Java

Liu, Wendi and Demirel, Yigit Kemal and Budi Djatmiko, Eko and Nugroho, Setyo and Tezdogan, Tahsin and Kurt, Rafet Emek and Supomo, Heri and Baihaqi, Imam and Yuan, Zhiming and Incecik, Atilla (2018) Bilge keel design for the traditional fishing boats of Indonesia’s East Java. International Journal of Naval Architecture and Ocean Engineering. ISSN 2092-6790 (In Press)

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Seakeeping, especially for the roll motions, is of critical importance to the safe operation of fishing boats in Indonesia. In this study, a traditional East Java Fishing Boat (EJFB) has been analysed in terms of its seakeeping performance. Furthermore, a bilge keel was designed to reduce the roll motions of the EJFB using multiple stages approach. After installing the designed bilge keels, it was shown that up to 11.78 % and 4.87 % reduction in the roll response of irregular seaways and the total resistance under the design speed, respectively. It was concluded that the roll-stabilized-EJFB will enhance the well-being of the fisherman and contribute to the boats’ safe operation, especially in extreme weather conditions. Moreover, the total resistance reduction of the EJFB due to the installation of the designed bilge keels also resulted in increased operational efficiency and reduced fuel costs and fuel emissions for local stakeholders.