The study ot the dynamic stability of aero‐planes by the method of motions of small amplitude requires the determination of oscillatory or aperiodical motions. With the numerous standard examples available it is easy to calculate the period and the damping factors of such motions, but as a rule the examples throw no light on the amplitude of the motions that develop. In this paper the author seeks to determine the phenomena arising after a series of typical initial disturtances and in the course of this determination deals with a series of numerical examples.
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