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DYNAMIC STABILITY
The requirement on dynamic stability is typically expressed in terms of the damping and frequency of a natural mode. Thus the USAF (1980) requires the damping and frequency of the lateral oscillation for various flight phases and stability levels to conform to the values in Table 1.4.
STALLING AND SPINNING
Finally, most requirements specify that the airplane’s behavior following a stall or in a spin shall not include any dangerous characteristics, and that the controls must retain enough effectiveness to ensure a safe recovery to normal flight.
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Table 1.4′ Minimum Dutch Roll Frequency and Damping
‘Level, Phase and Class are defined in USAF, 1980. *Note: The damping coefficient (, and the undamped natural frequency u>n, are defined in Chap. 6. |
