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|  Stability
T-45A/C TS, E2C2, ADV & IUT Aero-04
b.
Spiral Divergence
Sg 4, fr 7
Fig 7: Spiral
(1) strong directional stability relative to weak
Divergence
lateral stability
(2) bank angle keeps relative wind moving off
nose
(3) aircraft continues to chase relative wind
(4) tight descending spiral develops
(6) stop spiral by raising wing with aileron
(7) directional stability usually design stronger
than lateral stability in most aircraft
5ROO
Figure 7: SPIRAL DIVERGENCE
(8) T-45 characteristics
(a) demonstrated a slowly divergent spiral
mode with asymmetrical stores
loadings
(b) Onset is slow, with bank angle
doubling every 25 seconds
Page 4-16
(9-99) Original
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