Lateral lateral–directional aerodynamic coefficient modeling during aircraft design phases

Abstract

© 2017, American Institute of Aeronautics and Astronautics Inc, AIAA. All rights reserved.After a previous work showing the aerodynamic longitudinal coefficients modeling, the authors continue to present the techniques to obtain the aircraft coefficients and how to structure them in an aerodynamic model but now with focus on the lateral-directional coefficients. Thus, the aim of this work is to present appropriated methodologies available used to calculate and model aerodynamic lateral-directional coefficients in the distinct phases of the aircraft design, mainly in the Conceptual and Preliminary Phases. In addition, the main recommended practices and general structure of the aerodynamic model are described in order to satisfy the requirements of different technologies during design cycles, such as Loads and Flight Dynamics. The procedures to obtain lateral-directional aerodynamic coefficients and derivatives from wind tunnel tests, theoretical and empirical methods are also presented here. The methodologies and techniques described in this work are available in public domain. The methodologies approaches described achieve a specific model complexity level and accuracy that depends on the aircraft design phase, staff expertise, company experience and design budgets. Apart from the methodology approach the understanding of the best practices and methodologies regarding aerodynamic modeling is essential to achieve success in the aircraft design. Thus, this work brings a contribution in the sense to present appropriated procedures to develop aerodynamic models under design constraints.