Flying Qualities Estimation Methods for Small Unconventional Aircraft

Hospodář, P.; Vrchota, P.; Drábek, A.
July 2011
International Review of Mechanical Engineering;Jul2011, Vol. 5 Issue 5, p1026
Academic Journal
This article describes a methodology of the aerodynamic calculation and experimental measurement, which leads to determination of flight conditions within design of small unconventional aircraft. The first part contains the application of various types of computational methods to determine the aerodynamic characteristics. The results serve as the source material for the flight qualities determination. The second part describes validation and evaluation process. The data obtained from calculation, wind tunnel testing and flight tests were compared with special focus on flying qualities determination. Individual types of methods were step by step applied on the development of the small unconventional aircraft. The various stadium of the aircraft design were considered. The handbooks methods used in the preliminary design through the "simple" panel methods up to the advanced CFD methods. These advanced methods can be used in the final part of the geometrical design. This procedure reduces time and financial demands on the development. Second part is devoted to the validation of the computational results. The wind tunnel results and data from flights tests were used as a baseline. Two aspects were considered during evaluation of obtained results. One aspect takes into account flying qualities where the frequency and the damping are determined by the calculation of eigenvalues of the nonlinear model. Another aspect allows obtaining the complex view and the possibilities of the various methods which can be applied in the individual phases of the aircraft design from the point of view of the aerodynamics and the flight dynamics.


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