Subsonic Aerodynamic Stabilization of Long, Low-Drag Bodies of Revolution Using Boattail Fins
PICATINNY ARSENAL DOVER NJ
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Subsonic three-degree-of-freedom wind tunnel tests were utilized to demonstrate the dynamic instability of a five and one half caliber long, spin stabilized body of revolution. A modification of this body, i.e., the addition of fins to the boattail section, is shown to be an effective means of controlling this instability. The optically acquired angular orientation data was fitted to a closed form solution of the differential equations of motion. The pitching, damping, and Magnus moments were evaluated as both linear and nonlinear functions of angle of attack. The airflow over the model was observed by means of smokeflow photography.
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