A fixed pitch propeller design was developed for a high speed patrol boat. The primary design goals were to maintain speed at increased displacement, reduce cavitation thrust breakdown, reduce cavitation noise, and eliminate cavitation erosion. Special attention was paid to the suppression of root cavitation. Because of the open shaft configuration, the primary inflow wake was produced by shaft inclination. The relatively simple wake field permitted accurate quasi-steady panel method calculations of blade pressure distributions. Panel calculations modeling the blade and hub were used to iteratively alter blade shape to optimize performance. Model scale open water and cavitation tests were conducted to assess the performance of the new design. Full scale performance and cavitation viewing trials were conducted and verified design improvements.

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