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b) Phase plane plot
Fig. 8.46 Wing rock characteristics of generic aircraft modell,9 (Courtesy AGARD.)
system produce the necessary rolling moments. In other words, the wing and tail
surfaces, coming under the influence offorebody vortices, merely serve as aerody-
namic surfaces to generate the necessary rolling moments to sustain the wing rock.
8.10.1 Effectof Forebody Geometry
The fact that the forebody-induced wing rock is caused by the forebody vor-
tices suggests that the forebody geometry must have a significant effect on the
forebody-induced wing rock. The generic aircraft model of Fig. 8.45 was tested
with four different forebody cross-sectional shapes, which were horizontal ellipse,
circle, vertical ellipse, and triangle. In Fig. 8.47, the static lateral and directional
stability denvatives for these four different cross-sectional shapes are presented. It
is interesting to observe that the forebody with horizontal ellipse cross section has
the highest levels of directional and lateral stabilities yet has the maximum wing
rock amplitude as shown in Fig. 8.48. The vertical elliptical cross section has the
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