![]() This mean line is equidistant at all points from the upper and lower surfaces.Īn airfoil is constructed in such a way that its shape takes advantage of the air’s response to certain physical laws. ![]() Another reference line, drawn from the leading edge to the trailing edge, is the mean camber line. The distance from this chord line to the upper and lower surfaces of the wing denotes the magnitude of the upper and lower camber at any point. The rounded end, which faces forward in flight, is called the leading edge the other end, the trailing edge, is quite narrow and tapered.Ī reference line often used in discussing the airfoil is the chord line, a straight line drawn through the profile connecting the extremities of the leading and trailing edges. NOTE: The two extremities of the airfoil profile also differ in appearance. The camber of the upper surface is more pronounced than that of the lower surface, which is usually somewhat flat. Notice that there is a difference in the curvatures (called cambers) of the upper and lower surfaces of the airfoil. By looking at a typical airfoil profile, such as the cross section of a wing, one can see several obvious characteristics of design. ![]() Air acts in various ways when submitted to different pressures and velocities but this discussion is confined to the parts of an aircraft that a pilot is most concerned with in flight-namely, the airfoils designed to produce lift. An airfoil is a structure designed to obtain reaction upon its surface from the air through which it moves or that moves past such a structure. ![]()
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