IHS ESDU Lift-curve slope and aerodynamic centre position of wings in inviscid subsonic flow. 70011

ESDU 70011 presents data for the lift-curve slope and aerodynamic centre position for wings with straight leading- and trailing-edges and streamwise tips in subsonic flow. The data were derived from lifting-surface theory and are presented in carpet form for βA up to 12, Atanλ½ up to 6 and taper ratio (λ) from 0 to 1, where A is aspect ratio, β is (1 - M2)½ where M is Mach number, and λ½ is the half-chord sweep. The data can be applied to other than straight-tapered planforms by means of the equivalent wing planform concept (ESDU 76003 or ESDU 76015). Comparisons with a wide range of test data indicate that the lift-curve slope of wings on wing-body combinations is predicted to within about 5% and that aerodynamic centre position is predicted generally to within 0.03 of the aerodynamic mean chord. A computer program of the method (ESDUpac A7011) is provided. The program, which includes an extension to cover wings with modestly swept forward half-chord lines, can be run online at esdu.com.For information, an improved form of the Helmbold-Diederich equation for wing lift-curve slope is given which provides predictions largely within ±2% of the values obtained from this Data Item for βA ≥ 1.5.