Abstract
Indonesia is the largest archipelago country in the world. Territorial disputes and illegal fishing are some main threat of maritime defense. One of the solutions is to provide a multi-mission vehicle. Submarine craft has the advantage of undetectable to ambush the threats. Hydrofoil craft has the advantage of higher speed than the conventional high-speed craft. The purpose of this research is to combine two distinctive and one conventional concept into one craft. This craft has to has a light structure to support hydrofoil mode and able to submerge. The material of the hull uses aluminum and for wing and propulsion system structure use carbon steel. This craft uses hydraulic propulsion that the main engine moves the hydraulic pump. The hydraulic pump flows oil to the hydraulic motor where located in the nacelle. The hydraulic motor rotates the shaft and propeller. This propulsion system requires the propeller to submerge in the water, therefore the strut which supports the wing and propulsion system has to design retractable. All important parameters are included in this paper.
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