Nonplanar vortex lattice method for analysis of complex multiple lifting surfaces

A method for determining the aerodynamic characteristics of complex multiple lifting surfaces in inviscid subcritical flows has been developed and programmed on UNIVAC 1100/60 computer. 13; Each lifting surface is represented by a network of non-planar horse shoe vortices distributed on the mean surface and trailing to infinity. The strengths of these vortices are determined by requiring the flow to be parallel to the surface at a number of control points. The force due13; to a vortex segment is calculated as the vector product of local velocity and the vortex strength multiplied by density.13; The programme can handle wings with breaks and span wise segmented flaps in leading and trailing edges, local dihedral, camber and twist. The code can be used to compute lift, induced drag and pitching moments for any lifting planar of non-planar surfaces and surfaces in combination13; like wing-canard or wing-horizontal tail. The programme has been validated for a number of configurations for which experimental data is available