Propeller tunnels fitted to high-speed yachts are becoming more prevalent. The advantages of reduced operating draft or the possibility of using larger propellers are attractive to the boat builder. This paper examines the effects of propeller tunnel applications on propeller cavitation/vibration characteristics as compared to more traditional non-tunnel configurations. Propeller-induced excitation levels are calculated for a systematic series of hull configurations with varying propeller tip clearances. Calculations are given for standard 4 and 5-bladed propellers.

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