Validation of a multipoint approach for modeling spin aerodynamics

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during the spin. The rolling-moment and yawing-moment coefficient variations were relatively small, and thus, the steadyspin assumption is reasonable for these quantities. In contrast is the large amplitude of the pitching moment coefficient trace. The maximum and minimum values of the free-spin results are approximately equal to the rotary balance coefficient ±90%. Clearly, the steady-state results do not capture the true nature of the moment coefficient in this case. This trend would obviously be more exaggerated if the spin became more oscillatory.