Linear Theory of a Dual-Spin Projectile in Atmospheric Flight.

Report No. ARL-CR-448
Authors: Mark F. Costello, Allen A. Peterson
Date/Pages: February 2000; 64 pages
Abstract: The equations of motion for a dual-spin projectile in atmospheric flight are developed and subsequently utilized to solve for angle of attack and swerving dynamics. A combination hydrodynamic and roller bearing couples forward and aft body roll motions. Using a modified projectile linear theory developed for this configuration, it is shown that the dynamic stability factor, S(g), and the gyroscopic stability factor, S(g) are altered compared to a similar rigid projectile, due to new epicyclic fast and slow arm equations. Swerving dynamics including aerodynamic jump are studied using the linear theory.
Distribution: Approved for public release
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Last Update / Reviewed: February 1, 2000