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Experimental Investigation of Lift, Drag, and Pitching Moment of Five Annular Airfoils

H. S. Fletcher

Abstract

From Summary: An investigation was carried out in the Langley stability tunnel to determine the lift, drag, and pitching-moment characteristics of a family of annular airfoils. The five annular airfoils had equal projected areas but had varying chords and diameters which covered aspect ratios of 1/3, 2/3, 1.0, 1.5, and 3.0. The results showed that the effects of aspect ratio on the aerodynamic-center location were similar for annular and unswept airfoils and that annular airfoils had larger maximum lift-drag ratios below an aspect ratio of 2.4 than did plane rectangular airfoils with faired tips.

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Key concepts: Airfoil, Aerodynamic center, Pitching moment, Lift-induced drag, Drag, Lift (data mining), Lift-to-drag ratio, Zero-lift drag coefficient