Experimental investigation of lift, drag, and pitching moment of five annular airfoils

Herman S. Fletcher
Oct 1957

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 rations of 1/3, 2/3, 1.0, 1.5, and 3.0.

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