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

Herman S. Fletcher
naca-tn-4117
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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