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Abstrak :
The flat plate ship is a ship that is being developed and has entered the mass production stage of the Ministry of Research and Technology Republic of Indonesia. This is related to the function of flat plate vessels that are suitable with the conditions and needs of the Indonesian state, namely the massive production of marine fleets. Flat plate ships provide advantages including production cost efficiency which is far more economical than ships in general because it does not go through the bending process, so does the production time which can be shortened. But the flat plate ship still needs improvement, one of them is the ship propulsion. This study will combine a flat plate ship tunnel with a ducted propeller as an effort to increase thrust and hydrodynamic efficiency, with the ultimate goal of reducing fuel demand from flat plate vessels. The title of the research that was raised was the Analysis of the Combination of the Use of Tunnel and Ducted Propeller Against Increased Thrust on Flat Plate Ships: Trawler Fishing. The research method used is bollard pull / trawl pull using reference bollard pull guidelines - ITTC. Using a 70cm model ship with three configurations to be a comparison of the resulting value. The configuration used is conventional fishing trawler type flat plate without tunnel, and flat plate ship with Tunnel with all configurations using open and ducted propeller. This study succeeded in producing the desired destination with a combination of Tunnel and Ducted able to increase hydrodynamic efficiency and thrust values compared to other configurations. So that this research is expected to be one of the references to propulsion solutions and designs on flat plate vessels.

Abstrak :
Sistem propulsi adalah salah satu sistem utama yang mendukung operasional kapal. Pada umumnya, kualitas sistem propulsi yang diaplikasikan pada sebuah kapal ditunjukkan oleh efisiensi kerja yang dihasilkan. Ducted propeller merupakan salah satu sistem propulsi yang banyak digunakan di kapal untuk meningkatkan efisiensi dan gaya dorong. Hal ini dipengaruhi oleh nozzle yang digunakan untuk melingkupi propeller sehingga dapat meningkatkan kecepatan aliran air. Penelitian ini dilakukan untuk mengetahui pengaruh pembesaran ukuran diameter ducted propeller nozzle terhadap parameter hidrodinamis kapal, yaitu koefisien gaya dorong, koefisien torsi, dan efisiensi open water, sehingga digunakan dua model ducted propeller nozzle dengan diameter berbeda untuk mengetahui pengaruh yang ditimbulkan. Pengambilan data dilakukan melalui program Computational Fluid Dynamics dengan pengaturan program simulasi yang telah divalidasi terhadap Diagram Wageningen Series B4-60. Hasil penelitian menunjukkan bahwa pada advance ratio 0,54, ducted propeller nozzle dengan diameter 1,4 kali dari propeller menghasilkan efisiensi open water 5 lebih besar dibanding sistem propulsi open water.

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Propulsion system is one of the main systems that support ship operations. The quality of propulsion system applied in a ship can be shown by open water efficiency. Ducted propellers are one of the propulsion systems that most widely used on board to improve efficiency and thrust. This is influenced by the nozzle used to enclose the propeller for increasing velocity of water flow. This research is conducted to know effect of diameter ducted propeller nozzle dimension increasing to ship hydrodynamic parameters, as thrust coefficient, torque coefficient, and open water efficiency, so used two models of ducted propeller nozzle with different diameter to know the effect. Data retrieval is done through Computational Fluid Dynamics program by setting of the simulation program validated against Wageningen Series B4 60 Diagram. The results point that in advance ratio 0.54, ducted propeller nozzle with a diameter 1.4 times of the propeller resulted open water efficiency 5 larger than the open water propulsion system.