Roll Damping for Finned Projectiles Including: Wraparound, Offset, and ArbitraryNumber of Fins

摘要

An algebraic correlation for the roll-damping and roll-producing momentscoefficients for finned projectiles and missiles has been extended and verified to accept (1) bodies with arbitrary number of fins (i.e., not only four cruciform fins), (2) curved wraparound fins with fin cant, and (3) fins with offset angles. The extended correlation is also applicable in subsonic, transonic, and supersonic speed regimes. A direct method to compute the fin roll-producing moment from the fin normal force is provided to circumvent the lengthy and cumbersome semi-empirical existing methods. Seven different missile and projectile configurations with widely varying fin shapes and sizes were tested, and their measured data are provided for completeness. The present correlation is very simple and can be used to refine initial configuration selection and thus reduces the number of costly full flow field computations.