| Abstract | An oscillating foil propulsor was designed for a 200,000 DWT tanker using 2-dimensional linearized and noNewfoundlandinear theories. The linearized theory was used to obtain the optimal motion of the foil, i.e. the most efficient motion for the required thrust, and the propulsive performance was estimated by the more precise noNewfoundlandinear theory. An aft half elastic foil propulsor was designed as well as a rigid foil one. The results showed that the propulsive efficiency of the elastic foil propulsor was about 72% and 5.0% more than that of a screw propeller designed for comparison. The efficiency increase produced by the present oscillating foil propulsor was attributed to the considerable increase in the propeller working area due to the wide span of the foil. It can be said, therefore, that an oscillating foil propulsor becomes effective for a wide span ship where a conventional single screw propeller cannot avoid high propeller loading. |
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