Abstract:
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 bA up to 12, A tanf up to 6 and taper ratios from 0 to 1 where A is aspect ratio, b is root of one minus Mach number squared and f 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 per cent and that aerodynamic centre position is predicted generally to within 0.03 of the aerodynamic mean chord. The Helmbold-Diederich formula for lift-curve slope is also given. A Fortran program of the method (ESDUpac A7011) is provided on disc in the software volume in both uncompiled form and in ESDUview, a user-friendly shell that prompts on-screen for input data. The program includes an extension to cover wings with modestly swept forward half-chord lines.

See also:

• AERODYNAMIC CENTRE
• LIFT-CURVE SLOPE
• WINGS

Details: