LATERAL DIRECTIONAL FLYING QUALITIES
Requirements on the three lateral-directional modes to assure a desired level of flying quality can be found in Reference 9.1. Although specific to military aircraft, these criteria can obviously prove of use in the evaluation or design of civil aircraft. Tables 10.1, 10.2, and 10.3 present criteria for the three
Table 10.1 Maximum Roll Mode Constant
“ C and L refer to carrier and land operations.
Table 10.2 Minimum Dutch Roll Frequency and Damping
Table 10.3 Spiral Stability—Minimum Time-to-Double Amplitude
modes as a function of the Cooper-Harper level, flight phase category, and class of airplane. Airplane class is defined according to:
Class I —Small, light airplanes.
Class II —Medium weight, low-to-medium maneuverability.
Class III—Large, heavy, low-to-medium maneuverability.
Class IV—High maneuverability.