The purpose of the present paper is to show that the dihedral effect of the horizontal tail has significant effect on the T-tail flutter and that the flutter speed is appreciably dependent on the angle of attack of the horizontal tail surface. Flutter characteristics of a simplified T-tail is allalysed. Quasi-steady aerodynamic force is used to represent the dihedral effect of the horizontal tail. Some references are made to experimental data on the T-tail flutter which show a tendency similar to our analytical results.
An experimental inveStigation of some effects of longitudinally and vertically varied location of one, engine-pod like shaped, concentrated mass on transonic flutter characteristics of thin cantilever wings having a sweptback angle of quarter chord line of 20° and panel aspect ratio and taper ratio of 4.0 and 0.4, respectively, has been conducted in the N.A.L. 60cm×60cm transonic blowdown wind tunnel for flutter testing at Mach numbers between 0.759 and 0.964. The experimental results are presented in comparing the boundaries of flutter density and experimental flutter-velocity coefficients of the respective wing-pod configuration experimented, as a function of Mach number, and also are compared with the calcullated results by the matrix iteration method employing two-dimensional incompressible unsteady flow theory as required oscillatory aerodynamic forces.