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Aircraft dynamic modes
The dynamic stability of an aircraft refers to how the aircraft behaves after it has been disturbed following steady non-oscillating flight.〔Etkin, Bernard; Dynamics of Flight; 1982; ISBN 0-471-08936-2
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==Longitudinal modes==
Oscillating motions can be described by two parameters, the period of time required for one complete oscillation, and the time required to damp to half-amplitude, or the time to double the amplitude for a dynamically unstable motion. The longitudinal motion consists of two distinct oscillations, a long-period oscillation called a phugoid mode and a short-period oscillation referred to as the short-period mode.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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