Abstract
Classic handling performance criteria allow evaluating properties of aircraft equipped with typical flight control systems. New methods of aircraft control, like thrust vectoring, as well as aerodynamics configuration modification of aircraft, require employing other criteria for evaluating flying qualities. One of the groups of aircraft characterized by controlled configuration (Control Configured Vehicle - CCV) is those employing Direct Lift Control - DLC. Employing such control changes both static properties of aircraft (in steady states) and its dynamic properties (stability and controllability). In this paper, an attempt has been made to evaluate influence of DLC type system parameters on aircraft's maneuverability and to determine desired values of these parameters for the purpose of obtaining requested values of the handling qualities criteria. Published papers which deal with direct lift control do not list requirements for evaluating handling qualities and maneuverability of aircraft equipped with DLC system. In this paper, three criteria permitting evaluation of results of employing DLC have been defined. Analysis of influence of DLC system parameters on selected known handling qualities criteria (for example CAP, C*), as well as new DLC efficiency coefficients, have been illustrated with a numeric example of A4D Skyhawk aircraft control system modification. Simplified analysis of direct lift control influence on dynamic properties of aircraft
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