Aerodynamics of wraparound fins

A possible reason for the induced rolling moments occurring on wraparound-fi ns (WAF) configurations in subsonic flight at zero angle of attack is suggested. The subsonic potential flow over the configuration at zero incidence is solved numerically. The body is simulated by a distribution of sources along its axis, and the fins are described by a vortex lattice method. It is shown that rolling moments can be induced on the antisymmetric fins by the radial flow generated at the base of the configuration, either over the converging separated wake or over the diverging plume of a rocket motor.

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