Handling Qualities of Unstable Highly Augmented Aircraft (Les Caracteristiques de Manoeuvrabilite des Aeronefs Instables a Stabilite Augmentee)
ADVISORY GROUP FOR AEROSPACE RESEARCH AND DEVELOPMENT NEUILLY-SUR-SEINE (FRANCE)
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Demanding requirements for performance and handling qualities together with extended flight envelopes lead to use of new technologies like active control and control configured unstable vehicles. The review of the handling qualities issues of unstable aircraft which by necessity are highly augmented is the theme of this report. In general the handling qualities criteria for highly augmented stable aircraft are equally applicable to the specialized case of unstable aircraft. Accordingly, this report contains a review of existing highly augmented aircraft, both stable and unstable. Handling qualities criteria for both large and small amplitude longitudinal maneuvers are presented. Handling qualities criteria for both large and small amplitude longitudinal maneuvers are presented. Other areas of interest are also considered basic aerodynamic design, specific issues relating to the feel system and control sensitivity, evaluation techniques and the handling qualities design and evaluation process. The subjects of carefree handling, lateral- directional criteria and agility are presented in separate appendices. Where possible the lessons to be learned from the combined experiences of the working group are highlighted.