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i t_
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>
t_
en
t_
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4
m
_E 1
Airspeed,
KTAS
o 250
rq 275
A 300 .......
o 325
V 350
+ 375
x 400
.= -.I.---_L-4p._
_O _3-1
01-1_'Be _3-1
i
i
Oo/ [30/ _E / Vs
t_:_° _1 +1
_2 / _/E _ _I I
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-1
-3 -2o5 -2 -1.5 -1 -.5
Real part, per rev (expanded scale)
_0/_E •
Figure 8. Eigenvalues for C97 model with corrected engine-shaft damping and additional flutter-solution degrees of
freedom; 250-400 KTAS speed variation at 86% rotor speed (symmetric modes only).
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II
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47