Numerical lifting-surface theory - Problems and progress.

Nomenclature s = semispan t — nondimensional time referred to b/U A — aspect ratio U = reference speed = flight speed B — M — 1 = — 0 w = upwash prescribed by wing motion b = reference length = root semichord X = x — xi c = local semichord Y = — y CL = lift coefficient Z = complex transversal variable = + iz CM, CN = pitching and yawing moment coefficients, respecx, y, z — nondimensional Cartesian coordinates tively XL, XT = coordinates of the leading and the trailing edge, Cp — pressure coefficient respectively k = reduced frequency = ub/U % = chordwise variable Kp, K(j, = kernel functions relating pressure and upwash and 77 = spanwise variable potential and upwash, respectively <p = nondimensional acceleration potential referred to L'(y] = lift per unit span t/ M = Mach number $ = nondimensional velocity potential referred to Ub q = dynamic pressure = Jp£7 $ = nondimensional integrated acceleration potential R = (Z +/3F) referred to Ub