One of the most issues on a boat for using energy is resistance. Therefore some energy is needed to be able to overcome the boat resistance. The total resistance depends on the speed of the boat. By reducing the resistance, it will affect the energy usage on the boat. One way to reduce the boat resistance is by installing a stern flap to the stern. Stern flap is a new addition on the stern appendage. Previous studies, the stern flap was able to reduce the resistance. The reduction of resistance occurred on boats can reduce fuel consumption, so it can be one of the innovations in combating the energy crisis. This study used an experimental method that analyzes the position and size of the stern flap, where each position and size of the flap were tested at the same load. From the results and analysis, it shows that the changing position of the stern flap on the surface of the water will increase the boat speed by 4.62% and the changing size of the stern flap size to 85 × 80 cm will increase the speed of the boat by 3.82%.
Rudder is the most important hydrodynamic control surface on a ship to control horizontal movement. An important function of the rudder is to develop a force concerning orientation and motion relative to the water. The widely used type is the conventional type. However, the other types of rudders, other than the conventional type, are the single plate and fishtail types. This study aims to analyze the difference in performance between the single plate rudder on the Adeline 01 spob (self propeller oil barge) ship and the fishtail rudder on the value of lift force and drag force as well as find out the comparison of the two Rudders on the maneuvering force of the Adeline 01 spob ship. The method used was the Clark equation with the help of a CFD-based application to determine the performance of the ship lifts force and drag force by varying the turning angle by 5°, 10°, 15°, 20°, 25°, and 30°. The results obtained from this study was the Fishtail has better maneuverability at 5° and 10° angle variations with lift coefficient values of 0.0398 and 0.0522, and with Steady Turning Diameter (STD) values of 1882.9 m and 717.83 m. On another hand, the Single Plate rudder has better maneuverability at angle variations of 15° and 20° with lift coefficient values of 688.30 m and 330.77 m, and with STD values of 688.30 m and 330.77 m. At the angle variations of 25° and 30°, Rudder Fishtail has better maneuverability with lift coefficient values of 0.7712 and 0.9993, and with Steady Turning Diameter (STD) values of 53.40 m and 35.92 m
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