The use of canards in advanced aircraft for control and improved aerodynamic performance is a topic of continued interest and research. In addition to providing maneuver control and trim, the influence of canards on wing aerodynamics can often result in increased maximum lift and decreased trim drag. In many canard-configured aircraft, the main benefits of canards are realized during maneuver or other dynamic conditions. Therefore, the detailed study and understanding of canards requires the accurate prediction of the non-linear unsteady aerodynamics of such configurations. For close-coupled canards, the unsteady aerodynamic performance associated with the canard-wing interaction is of particular interest. The presence of a canard in close proximity to the wing results in a highly coupled canard-wing aerodynamic flowfield which can include downwash/upwash effects, vortex-vortex interactions and vortex-surface interactions. For unsteady conditions, these complexities of the canard-wing flowfield are further increased. The development and integration of advanced computational technologies provide for the time-accurate Navier-Stokes simulations of the steady and unsteady canard-wing-body flox, fields. Simulation, are performed for non-linear flight regimes at transonic Mach numbers and for a wide range of angles of attack. For the static configurations, the effects of canard positioning and fixed deflection angles on aerodynamic performance and canard-wing vortex interaction are considered. For non-static configurations, the analyses of the canard-wing body flowfield includes the unsteady aerodynamics associated with pitch-up ramp and pitch oscillatory motions of the entire geometry. The unsteady flowfield associated with moving canards which are typically used as primary control surfaces are considered as well. The steady and unsteady effects of the canard on surface pressure integrated forces and moments, and canard-wing vortex interaction are presented in detail incl..

The Lavi fighter program, the largest weapons-development effort ever undertaken by the State of Israel, envisioned a new generation of high-performance aircraft. In a controversial strategy, Israel Aircraft Industries intended to develop and manufacture the fighters in Israel with American financial support. The sophisticated planes, developed in the mid-1980s, were unique in design and intended to make up the majority of the Israeli air force. Though considerable prestige and money were at stake, developmental costs increased and doubts arose as to whether the Lavi could indeed be the warplane it was meant to be. Eventually the program became a microcosm for the ambitions, fears, and internal divisions that shaped both the U.S.-Israeli relationship and Israeli society itself. But the fighter never made it to operational service, and until now, the full breadth and significance of the Lavi story have never been examined and presented. Lavi: The United States, Israel, and a Controversial Fighter Jet traces the evolution of the Lavi fighter from its genesis in the 1970s to its scrapping in August 1987. John W. Golan examines the roles of Israeli military icons and political leaders such as Ezer Weizman, Ariel Sharon, Menachem Begin, and Yitzhak Rabin in the program and in relation to their counterparts in the United States. On the American side, Golan traces the evolution of government policy toward the program, detailing the complex picture of the U.S. foreign policy apparatus and of U.S.-Israeli relations in general—from President Reagan’s public endorsement of the program on the White House lawn to Defense Secretary Caspar Weinberger’s unremitting attempts to cancel it in succeeding years.