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This paper shows the numerical and experimental results about the hydrodynamic characteristics of X-Twisted rudders having continuous twist of the leading edge along the span. All the results were compared with those of the semi-balanced rudder. Calculation through the Reynolds-Averaged Navier-Stokes Equation (RANSE) code with propeller sliding meshes shows large inflow angle and fast inflow velocity in the vicinity of ±0.7 R from the shaft center, so it may cause cavitation. Also, X-Twisteddoi:10.2478/ijnaoe-2013-0100 fatcat:jmdbvm2yqne2bbv2egnuee2zfq