Abstract
This paper presents a simple practical method to show the forces of the surface propeller during one cycle and the effect of the immersion depth and blade number on the performance of the surface propeller (SP). During one cycle of the propeller rotation, each blade enters the water and exits from it. The entry and exit angles are determined by the geometrical formulas. Three forces (thrust, horizontal and vertical forces) and torque are calculated by assuming that the thrust and torque are uniformly distributed on the blade. The results are presented at three immersed ratios (IT=0.25, 0.33, 0.5) for three blade numbers (Z=3, 4, 5). Many results of thrust and torque as well as horizontal and vertical forces are presented and discussed.
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