ABSTRACT
Contributions of various airplane configuration parameters to lateral-directional modes via aerodynamic derivatives that we extracted in Chapter 6 are presented in detail in this chapter. Coupling of roll and yaw dynamics, for example, yaw stiffness caused by vertical tail also results in dihedral effect and a wing sweep contributes to both yaw and roll stability, is established from derivation of the lateral-directional aerodynamic derivatives. Handling qualities requirements for lateral-directional modes are adequately presented. Expressions for lateral-directional control derivatives with primary contributions from rudder and aileron are derived. Relevant supplementary materials are provided in the boxes and simulations representing lateral-directional manoeuvres using real aircraft data are presented. Further, based on stability arguments, a case study on ‘why birds don't need vertical tails’ is presented in the appendix (Box 7.3).
