1976•Journal of Ship ResearchRequires access

Optimum Propellers with Cavity-Drag and Frictional-Drag Effects

Byung-Seung Yim

Abstract

In a variational problem for the optimum pitch distribution of a propeller, the Euler differential equation with Munk's displacement theory is utilized. Effects of frictional-drag and cavity-drag are considered through simple approximate relations of drag-lift ratio and the circulation. Simple relations between the optimum pitch distributions and the drag-lift ratio are obtained both for free-running and wake-adapted propellers.

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Key concepts: Drag, Zero-lift drag coefficient, Lift-induced drag, Lift-to-drag ratio, Parasitic drag, Mechanics, Wake, Lift (data mining)