Abstract
The flutter speed of a T-tail depends strongly on the angle of attack or dihedral angle of the horizontal tail plane (HTP). The unsteady rolling moment acting on the HTP oscillating in yaw and sideslip, which is induced by the bending and torsion of the vertical tail plane, plays a critical role in this phenomenon. In this paper, a 3D Navier-Stokes code that takes into account the in-plane motion of the HTP is developed, and the unsteady flow features of transonic flow around an oscillating T-tail are clarified, especially, in relation to the mechanism generating the rolling moment.
