Author(s)

G.K. Politis

Abstract

The effect of the propeller ventilation and waves (regular or irregular) in propeller open water performance is investigated experimentally. Experiments have been performed in the towing tank of the National Technical University of Athens using the open water propeller dynamometer. Two model propellers have been selected with diameter D=0.2 m and pitch to diameter ratio P/D=0.78, 1.23 respectively. Time records of propeller thrust, torque and free surface elevation have then been taken for four different propeller axis depths covering the range from the fully submerged case to the fully ventilated case (i.e. propeller axis at the undisturbed free surface). Measurements have been performed in regular as well a

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