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The prevalent idea for preventing wing flutter is that the mass balance of an aileron or some irreversible control of the same aileron is the most effective. From our studies of this problem, we found that it is possible to raise the critical speed for wing flutter to a far greater extent, even beyond that of the case of a fixed aileron, by merely inserting suitable elastic and damping resistances between the main wing and the aileron. As a matter of fact, it is possible even for an aeroplane with fixed aileron to flutter were the machine to change its attitude from one of horizontal flight to steep dive under certain conditions with respect to its centre of gravity and to those of its linear and angular velocities, when it is, then, even possible for the angle of incidence to assume zero or negative value. The importance of raising the critical speed beyond that in the case of a fixed aileron is so obvious that no comment will be needed. The case here discussed concerns the torsion-aileron type of wing vibrations, when the wing is most liable to flutter. The wing model used in the experiments was of the U.S.A. 35A type of span, b = 34 cm, and chord, 1=10 cm, and it was made to oscillate only in the torsional sense about an axis, e= 1.5 cm, behind the leading edge. An aileron of chord, 1A = 2.5 cm (its centre of gravity is s w = 6.7 cm behind the torsional axis), extended throughout the whole span of the main wing. By means of this simple construction we were able to compare the experimental result with the mathematical theory," namely the solutions of the equations of motion

A Method of Raising the Critical Speed for Wing Flutter