Recent experimental results in axisymmetric free jets are discussed with an emphasis on the dynamics of their self-forced states. The role played by the initial shear-layer instabilities and their coupling with subsequent jet instabilities is examined to reveal key mechanisms and scaling relations.

In order to predict the dynamics of maneuvering aircraft or missiles at high rotational rates and high angles of attack, it is essential to accurately and efficiently model the nonlinearities associated with post-stall aerodynamics, including bifurcations and hysteresis. Nonlinear indicial theory offers a viable alternative which can fulfill the need for the efficient and accurate modeling of nonlinear "plant" characteristics. The present paper describes recent applications of linear and nonlinear indicial response models for aerodynamic prediction of maneuvering flight vehicles. NOMENCLATURE Symbols and abbreviations b Wing span c Wing chord C Sectional drag coefficient d

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