The NACA 23012 airfoil thus has a design lift coefficient of 0.3, has its maximum camber at 1.5 percent of the chord, and has a thickness ratio of 12 percent The last two integers indicate the airfoil thickness in percent of the chord. The second and third integers together indicate the distance from the leading edge to the location of the maximum camber, this distance in percent of the chord is one-half the number represented by these integers. The design lift coefficient in tenths is thus three-halves of the first integer. The first integer indicates the amount of camber in terms of the relative magnitude of the design lift coefficient. NACA FIVE DIGIT SERIES AIRFOILS : The numbering system for airfoils of the NACA five-digit series is based on a combination of theoretical aerodynamic characteristics and geometric characteristics. Thus, the NACA 2415 airfoil has 2-percent camber at 0.4 of the chord from the leading edge and is 15 percent thick. The second integer indicates the distance from the leading edge to the location of the maximum camber in tenths of the chord. The first integer indicates the maximum value of the mean-line ordinate in percent of the chord. NACA FOUR DIGIT SERIES AIRFOILS : The numbering system for the NACA airfoils of the four-digit series is based on the airfoil geometry. This can be done by describing the airfoil using 4, 5, 6, 7, or 8 digits. Airfoil NomenclatureĪ method of indicating characteristics of an airfoil. Upper surface is the surface of an aerofoil between the leading and trailing edges, on the upper surface. Trailing edge is a part from an aerofoil (edge) that hits the air particles last. Maximum thickness is the maximum distance of the lower surface from the upper surface. Maximum camber is the maximum distance of the mean camber line from the chord line. Mean camber line is a line joining the leading and trailing edges of an aerofoil, equidistant from the upper and lower surfaces. Lower surface is the surface of an aerofoil between the leading and trailing edges, on the lower surface. Leading edge is a part of an aerofoil (edge) that hits the air particles first. Chord is a distance between the leading and trailing edges measured along the chord line.Ĭhord line is a straight line joining the leading and trailing edges of an aerofoil.
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