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The Relation between the Skin Friction Drag and the Spin Reducing Torque

A. C. Charters, Robert Kent

Abstract

Abstract : On certain simplifying assumptions, a relation between the skin friction drag and the spin reducing torque or axial couple is deduced. On the basis of measured values of the axial couple coefficient the skin friction drag coefficient is deduced and compared with the measured total drag. A method is derived for utilizing the measured values of the axial couple coefficient to estimate the skin friction drag coefficient.

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Available abstract

Key concepts: Parasitic drag, Drag, Drag coefficient, Torque, Mechanics, Friction coefficient, Zero-lift drag coefficient, Friction torque