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(I I,I ) p~ < CD7/
and the second condition is given by
The first condition is equrvalent to
and
I)
I)
pli <
pg- > Co;/,
) f pg<
(-,,.,.)
(p )2 - (II /)
(p )2>
(I I,I)
(7.54)
(7.55)
(7.56)
(7.57)
(7.58)
(7.59)
(7.60)
  Suppose we plot (coo/Po)2 VS (cov,/Po)2 as shown in Fig. 7.2; then the first
condition corresponds to the shaded region I of pitch divergence. Here, the aircraft
experiences pitch divergence because it has a smaller level oflongitudinal stability
as indicated by Eq. (7.59) and a larger level of directional stability as indicated by
Eq. (7.60).
      Similarly, the second condition given by Eqs. (7.56) and (7.57) can be expressed
(p )2< (1 11)
(7.61)
(I .,
(I .,
(-,,
636            PERFORMANCE, STABILITY, DYNAMICS, AND CONTROL
and
GB.)2
(Stable)
┏━━━━━━━━┳━━━━━━━━━━━━━━━━━━━━━━━━━━┓
┃              l ┃                                                    ┃
┃.     .         ┃                                                    ┃
┃              , ┃                                                    ┃
┃              . ┃                                                    ┃
┃            ,   ┃                                                    ┃
┃            .   ┃                                                    ┃
┃  -a' .         ┃         ,P                                         ┃
┣━━━━━━━━╋━━━━━━━━━━━━━━━━━━━━━━━━━━┫
┃   8            ┃,-,,'.,.--/-/-,.-. , - -.-,-I.-.P-tc- Iv,ergence)PI ┃
┃ :-' ,:         ┃                                                    ┃
┃  ~)            ┃                                                    ┃
┃  y             ┃                                                    ┃
　
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