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Microtransat Challenge je mednarodno tekmovanje prečkanja Atlantika z avtonomno jadrnico brez človeškega nadzora. Ta mora prepluti Atlantski ocean med Evropo in Ameriko. Največji izziv predstavlja krmilni sistem, ki skrbi da jadrnica pride do cilja. V diplomski nalogi je predstavljeno konstruiranje krmilnega sistema ter poleg tega rešitev problema oddušnika. Predstavljen je nov hidravlični sistem jadrnice ki vsebuje hidravlično črpalko, tri hidravlične valje, povezovalne cevi ter vrvenico za krmiljenje dveh jamborov in krmila. Izdelan je 3d model novega hidravličnega sistema jadrnice ter izvedene meritve porabe električnega toka. V diplomskem delu je prikazana vgradnja celotnega krmilnega sistema. The Microtransat Challenge is an international race crossing the Atlantic with a selfpropelled yacht without human control. It must cross the Atlantic Ocean between Europe and America. The biggest challenge is the steering system, which ensures that the boat reaches its destination. The thesis presents the design of the control system and the solution to the vent problem. A new hydraulic sailboat system is presented, featuring a hydraulic pump, three hydraulic cylinders, connecting tubes and a rope for steering two masts and rudders. A 3d model of the new hydraulic system of the sailboat has been made, as well as a measurement of electricity consumption. The diploma thesis shows the installation of the complete control system.