This study deals with the optimal control of unmanned aerial vehicles (UAVs). Concerns about the minimum energy consumption of the UAV are still in the focus of attention of many researchers. The optimal control based on the cost function minimization of the closed loop automatic flight control systems of the UAV is one of the techniques effectively supporting solution of the gain selection of UAV autopilots. Recently, the worldwide application of the UAVs has resulted in the wider application

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... f the computer aided design of the closed loop flight control systems. This study highlights the optimal control of the multivariable UAV control systems, and presents a new design example based on Linear Quadratic Regulator (LQR) optimal control.