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PRELIMINARY STUDY OF RELATIONSHIPS BETWEEN STABILITY AND CONTROL CHARACTERISTICS AND AFFORD.pdf

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PRELIMINARY STUDY OF RELATIONSHIPS BETWEEN STABILITY AND CONTROL CHARACTERISTICS AND AFFORD

American Institute of Aeronautics and Astronautics 1 AIAA-98-4265 PRELIMINARY STUDY OF RELATIONSHIPS BETWEEN STABILITY AND CONTROL CHARACTERISTICS AND AFFORDABILITY FOR HIGH-PERFORMANCE AIRCRAFT Marilyn E. Ogburn* NASA Langley Research Center Hampton, VA Abstract This paper describes a study that is being done as part of the Methods for Affordable Design (MAD) program within the National Aeronautics and Space Administration (NASA), for which the goal is to develop design methods and information that contribute to reductions in the aircraft development cycle time while increasing design confidence throughout the design cycle. The product of the study will be a database of information that relates key stability and control parameters to affordability considerations such as air combat exchange ratio, safety of flight, and probability of loss of the aircraft or pilot. The overall background and methodology are described, and preliminary results are shown for the first phase of the study to evaluate characteristics in the longitudinal axis. For these preliminary results a simplified analytical model of the aircraft response to uncommanded nose-up pitching moments was developed and used to characterize the requirements for recoveries to controlled flight conditions and to evaluate some parameters that affect the survivability of the aircraft and the pilot. Introduction High-performance aircraft traditionally have been developed for maximum performance, with secondary consideration being given to the cost of _ _ _ _ _ _ _ _ _ _ *Senior Research Engineer, AIAA Associate Fellow Copyright ? 1998 by the American Institute of Aeronautics and Astronautics, Inc. No copyright is asserted in the United States under Title 17, U.S. Code. The U.S. Government has a royalty-free license to exercise all rights under the copyright claimed herein for Governmental purposes. All other rights are reserved by the copyright owner. the aircraft. In the post-Cold War era, howe