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8
"O
_)
10
>
=-
ff
t-
¢0
E
I
Airspeed,
KTAS
• 200
• 225
o 250
[] 275
A 300
o 325
v 350
0
(a) ._
-1.2 -1 -.e -.6 -.4 -.2 0 .2
7
01+1
133+1
Real part, per rev (expanded scale)
Airs )eed, _1_
KTAS
• 200
• 225
_" o 250
n 275
"o z_ 300 01 + 1
"1o o 325
_ "__)_ _3/ 13o/ _l.
_ 5_ v350 _P-&=_EF _3 +1
>
P 4 .............
3 - 1 _e----v
.m _ I+i
2 ....................
E _2 / _1 _G qf8 / _1
1 ...............
_', IP
(b) tl,
0 _ __ m = _ m e_ m db me
-1.2 -1 -.8 -.6 -.4 -.2 0 .2
Real part, per rev (expanded scale)
Figure 13. Eigenvalues for corrected model with 1 ° sweep, standard tips, and full control-system stiffness matrices;
200-350 KTAS speed variation at 80% rotor speed. (a) Symmetric modes. (b) Antisymmetric modes.
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