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. Surface-piercing propellers have been widely used in light and high-speedvessels because of their superior performance. Experimental study of thesepropellers is one of the most reliable and accurate ways which can providedetails about the performance and effect of different design parameters onthe performance of the surface-piercing propellers. In this research, afive-blade surface-piercing propeller was tested in the free surface watertunnel of Babol Noshirvani University of Technology in order to expand theavailable experimental data and database for future engineering designs. Theeffects of immersion ratio and shaft inclination angle on the propeller'sefficiency and hydrodynamic coefficients were examined. A free surface watertunnel and a calibrated dynamometer with the measurability of the thrustforces and the torque of a propeller were used for this purpose. Comparingthe obtained results with the existing semi-experimental equations shows thatthe equations presented in various geometric conditions are not accurateenough, and developing the existing database is necessary. The details of theobtained results showed that the hydrodynamic coefficients of the thrust andtorque increased by increasing the immersion ratio, but the coefficient ofhydrodynamic thrust and efficiency reduced. The results also indicated thatthe coefficient of torque increased by increasing the shaft inclinationangle. The highest efficiency of the propeller was achieved in the range of40 %–50 % immersion ratios at all angles of shaft inclination. Forall immersion ratios, the maximum and minimum efficiencies were obtained at 0and 15 shaft inclination angles, respectively. The best efficiency of thepropeller was at 50 % immersion ratio and zero shaft inclination angle.

Experimental study of immersion ratio and shaft inclination angle in the performance of a surface-piercing propeller