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Astrophysics & Aerospace Technology

Astrophysics & Aerospace Technology

ISSN: 2329-6542

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Aerodynamic Analysis

As usual in aerodynamic analysis, in order to obtain simple expressions for the derivatives of stability and control, a reference system of the wind axis is assumed. The choice of wind axes is convenient since it reduces the derivatives to their simplest possible description by retaining only the essential contributions and, therefore, maximizes the visibility of the physical phenomena involved. Therefore, it is very important to remember that if the derivatives thus obtained are necessary for use in equations of motion related to an alternative axis, then the appropriate axis transformation must be applied to the derivatives. Some useful transformations are given in Appendices 7 and 8 Appendix 7 Appendix 8. In all cases, analytical expressions are obtained for the derivatives assuming subsonic flight conditions; It is relatively easy to develop expressions to allow for the effects of the Mach number as suggested in Section 12.4. It has already been established that simple analytical expressions for derivatives rarely give precise estimates. Its utility is significantly more important as a means of explaining its physical origins, thereby providing the essential link between aircraft dynamics and fuselage aerodynamics. The analytical procedure for obtaining simple derived expressions has been well established for many years, and Babister (1961) and, in less detail, Babister (1980) amply describe the approach commonly found in the UK today. The following paragraphs owe a lot to that work, as it is unlikely that the treatment can be improved. For the calculation of more reliable estimates of derived values, it is recommended to refer to the ESDU data elements. The reader who requires a more detailed aerodynamic analysis of stability and control derivatives will find much useful material in Hancock (1995).

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