A computationally-based procedure developed for engineering powerboat propellers is presented Here powerboats are being distinguished from ships in that they are considered lo be at least partially planing, with their propellers distinguished from ship propellers in that blade cavitation is significantly involved in their propulsive performance. The engineering methodology is applied in an attempt to clarify an active issue in the selection of large sportfishing yacht propellers: larger diameter and lower RPM versus smaller diameter and higher RPM.

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