Aerospace Engineering > GATE 2011 > Dynamic Stability
An aircraft in level flight encounters a vertical gust, which excites the phugoid mode. The phugoid
motion completes 10 cycles in 50 s and its amplitude reduces to half of its maximum value in 25 s.
The eigenvalues of the phugoid mode are
A
-0.05±0.02i
B
-0.5±0.2i
C
-0.028±1.26i
D
0.028±1.26i

Correct : c

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