The development of underwater robot technology is growing rapidly. For reaching the best performance, it is important that the inno-vation on ROV should be focused on the thruster and propeller. In this research, the ducted propeller thruster is used while three types of SHUSKHIN nozzle are selected. The design is compared in ac-cordance with the thruster that has been made as the propulsion device of underwater robots. Each type of the thruster model indicates dif-ferent force and torque. For the analysis, each model is built in Computer Aided Design (Rhinoceros) program packages and Computa-tional Fluid Dynamics (CFD) to find the most optimal model which can produce the highest thrust. Among the entire model, the Kaplan series (Ka5-75) with the type C of nozzle has the highest thrust which is 2.53 N or 25.24% of extra thrust. For the optimization of thrust, genetic Al-gorithms (GA) is used. The GA can search for parameters in large multi-dimensional design space. Thus, the principle can be applied for determining the initial propeller that produces optimum thrust of ROV. The GA has success-fully shown able to obtain an optimal set pa-rameters for propeller characteristics with the best performance.

{"references": ["D. Christ, Roberto, L. Wernli Sr, Robert, The ROV Manual,user guide for observa-tion, United Kingdom: Burlington, 2007.", "S. A. Sharkh, M. R. Harris, R. M. Crowder, P. H. Chappell, R. L. Stoll, and J. K. Sykulski, \"Design considerations for electric drives for the thrusters of unmanned underwater vehicles,\" The 6th European Conference on peer Electronics and Application, vol. 3, pp. 799-804, 1995.", "V. Manen, J. D., and P. V. Ossanen, Prin-ciples of naval architecture, Volume II: Resistance, propulsion, and vibration, 2nd ed., New Jersey: Society of Naval Architects and Marine Engineers, 1988.", "G. Kuiper, \"New developments and propeller design,\" Journal of Hydrodynamics, Ser. B, vol. 22, no. 5, pp. 7-16, 2010.", "Parra and Carlos, \"Numerical investigation of hydrodynamic performances of marine propeller,\" Master Thesis, Galati University, 2013.", "M. M. Bernitsas, D. Ray, and P. Kinley, \"KT, KQ, and efficiency curves for the Wageningen B-Series propellers,\" Michigan Univ., Dept. of Naval Architecture and Marine Eng., USA, 1981.", "Goldberg and E. David, \"Genetic algorithms in search, optimization, and machine learning,\" Alabama Univ., USA, 1953."]}

The authors would like to thanks for the support of the BK21 plus MADEC human re-source development group in 2016, Pukyong National University, without their help, this paper could not be submitted.