Ericsson, L. E., Difficulties in Predicting Vortex Breakdown Effects on a Rolling Delta Wing, Journal of Aircraft, Vol. 33, No. 3, 1996, pp. 477-484. Atta, R., and Rockwell, D., Hysteresis of Vortex Development and Breakdown on an Oscillating Delta Wing, AIAA Journal, Vol. 25, No. 11, 1987, pp. 1512, 1513. Ericsson, L. E., and Reding, J. P., Fluid Dynamics of Unsteady Separated Flow, Part II, Lifting Surfaces, Progress in Aerospace Sciences, Vol. 24, 1987, pp. 249-356. Beyers, M. E., private communication, July 1994. Ericsson, L. E., and King, H. H. C, Effect of Cross-Sectional Geometry on Slender Wing Unsteady Aerodynamics, Journal of Aircraft, Vol. 30, No. 5, 1993, pp. 793-795. Lambourne, N. C., Bryer, D. W, and Maybrey, J. F. M., The Behavior of the Leading Edge Vortices over a Delta Wing Following a Sudden Change of Incidence, Aeronautical Research Council, R&M 3645, England, UK, March 1969. Elle, B. J., An Investigation at Low Speed of the Flow near the Apex of Thin Delta Wings with Sharp Leading Edges, Aeronautical Research Council, R&M 3176, England, UK, Jan. 1958. 1 Ericsson, L. E., and Reding, J. P., Approximate Nonlinear Slender Wing Aerodynamics, Journal of Aircraft, Vol. 14, No. 12, 1977, pp. 1197-1204. Lambourne, N. C., and Bryer, D. W., The Bursting of LeadingEdge Vortices—Some Observations and Discussion of the Phenomenon, Aeronautical Research Council, R&M 3282, England, UK, April 1961. by the Navier-Stokes equations, and the viscous effect of the passing vortex on the blade-vortex interaction can be investigated.