Analytical Criterion for Aircraft Spin Susceptibility

from the point of view of bifurcation theory. Two versions of an analytical criterion for predicting spin susceptibility are derived and their use is described. The rst version requires plotting the zero crossings of a simple algebraic equation in angle of attack, while the second involves plotting the locus of zeros of a single algebraic equation in two variables (angle of attack and yaw rate) { both equally quick and easy to use. Both versions of the criterion are tested with data for the F-18 HARV aircraft and they show an excellent match with spin prediction from exact numerical computations.

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