Abstract
Investigations are made in a two-dimensional smoke wind-tunnel for determining the lift coefficient of a wing section by observing the shape of a specified stream line. The wind-tunnel is of horizontal type, and the vertical locations of the stream lines can be changed finely so that the specified stream line passes through a fixed point at a given station upstream of the wing-section model. The ordinates of the stream line at the second and third stations downstream of the first are measured. The section lift coefficient and the position of the center of pressure are determined from the ordinates analytically. The experiments are carried out on three kinds of wing section; a symmetrical, a cambered, and one with a leadingedge slat and a double-slotted flap. The present method offers a convenient means for understanding how the flow pattern affects the section lift coefficient.
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