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The fin-tailplane configuration consists of two flat half-tailplanes and a flat fin joined together so as to be symmetric about the plane of the fin. The half-tailplanes may be set at a non-zero dihedral angle to each other. The chords of all the surfaces at their junction are of the same length and are coincident. The fin-tailplane configuration is assumed to be isolated and to be oscillating harmonically about its mean position in a subsonic flow whose main stream is parallel to the junction chord. The oscillatory motion is taken to be antisymmetric about the plane of the fin. Linearized equations of potential flow are assumed to be valid so that the normal velocities on the fin and tailplane surfaces may be related to the loadings on these surfaces by means of linear integral equations. These integral equations are solved numerically for the loadings for oscillation at general frequency in any antisymmetric modes, and the generalised airforce coefficients are then obtained. Approximations to the loadings are taken as linear combinations of basis functions.