Abstract
The properties of the flat spin mode of a general aviation configuration have been studied through analysis of rotary balance data. The equilibrium state is predicted well from rotary balance data. Linearized analyses about the flat spin attitude show the existence of two-coupled pitch-roll modes and a decoupled yaw mode. The stability of the flat spin mode has been examined extensively using numerical linearization, classical perturbation methods, and reduced order models. The stability exhibited by the time histories and the eigenvalue analyses is shown to be strongly dependent on the oscillatory aerodynamic derivatives. Explicit stability criteria are obtained from the reduced order models.
Published Version
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