![]() ![]() For rectangular wings, an important parameter is the aspect ratio that gives the span to the chord length. This equation is used for all airfoil shapes except for a basic trapezoid. Fortunately, there is a standard used for aerodynamics that enables the comparison between different wings and/or airfoil types.įor aerodynamics, the mean aerodynamic chord shown above is the standard by which chords are determined. There is also the tip chord, which is the length of the chord at the wing’s tip, and the root chord, which is the length nearest the plane’s fuselage.įrom the above, it is apparent that a single aircraft may have several chords. The same is true for the rudder, ailerons (typically used in pairs to prevent roll), and wing flaps (that help reduce the distance required for takeoff and landing). Chord is also used to describe the width of a wing, stabilizer, or rotor blade-for helicopters or some unmanned aerial vehicles-in the direction of airflow. The chord length is the distance from where the chord line intersects with the leading edge to the trailing edge of the airfoil.Ī good way to remember the difference between these two chords of an airfoil is that the chord line has no dimensionality, whereas the chord length is a dimension (e.g., ft, m, etc.). ![]() The chord line is a straight imaginary line that extends from the leading edge of the airfoil to the trailing edge.
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