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For all of the rest of the cycle, a~/8Az > 0. Therefore, the net effect because
of nomud vortex asymmetry is predominantly destabilizing. Therefore, for limit-
cycle wing rock, this destabilizing contribution must be balanced by a stabilizing
contribution from a source other than the positional asymmetry of the vortices. It
is possible that this stabilizing contribution could come from the time lag in vortex
strengths. Even though not much information is available on this subject, some
preliminary measurements have supported this line of tlunking:31
8.8.3 Effects of Vortex Breakdown
As we have mentioned prerriously, for the 80-deg delta wing model, the angle of
attack for the onset of wing rock is well below the value of angle of attack at which
O Static Position
ic Position
D
Fig. 8.38 Normal -vortex asymmetry on a rolling delta wing.31
STABILITY AND CONTROL PROBLEMS AT HIGH ANGLES OF AT1-ACK 709
03
0.4
0.3
o1
O*I
Az/s O
-0- I
-Ol
-0.3
4-4
-o-s
~boa
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┃ ┃ ┃ ┃ ┃ ┃ ┃ ┃ ┃ ┃
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┃qXoF ┃J ┃ ┃ ┃ ┃ ┃ ┃ ┃ ┃
┃lo\ ┃ o ┃ ┃ ┃ ┃ ┃ ┃ ┃ ┃
┃ ┃ ( ┃o ┃ ┃ ┃ ┃ ┃ ┃ ┃
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┃ I oi ┃( ┃ c ┃a- ┃\ ┃ ┃ ┃ ┃ ┃
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