Introduction to Aircraft Flight Mechanics: Performance, Static Stability, Dynamic Stability, and Classical Feedback Control

Appendix H: Stability Characteristics of Selected Aircraft

Lockheed C-5A

Aircraft Parameter

C-5A

C-5A

C-5A

Altitude (ft)

S.L.

20,000

40,000

Mach

0.25

0.7

0.7

True Airspeed (ft/s)

279

725

678

Dyn Pressure (lb/ft 2)

Weight (lb)

728,000

728,000

728,000

Wing Area S (ft 2)

6,200

6,200

6,200

Wing Span b (ft)

219.17

219.17

219.17

Wing Chord c (ft)

30.93

30.93

30.93

C.G. (x c)

0.25

0.25

0.25

Trim AOA (deg)

11.41

0.68

7.66

I xx S(slug-ft 2)

3.25 10 7

3.23 10 7

3.22 10 7

I yy S (slug ft 2)

3.28 10 7

3.28 10 7

3.28 10 7

I zz S (slug ft 2)

6.15 10 7

6.18 10 7

6.19 10 7

I xz S (slug ft 2)

?3.34 10 6

2.2 10 6

?1.42 10 6

Longitudinal Derivatives

X u (1/s)

?0.0111

?0.00283

?0.00339

X ? (ft/s 2)

?5.58

19.1

8.43

Z u (1/s)

?0.107

?0.042

?0.06

Z ? (ft/s 2)

?124

?450

?204

M u (1/ft s)

?0.00007

?0.00004

0.00005

M ? (1/s 2)

?0.76

?2.2

?1.07

(1/s)

?0.169

?0.21

?0.113

M q (1/s)

?0.67

?0.898

?0.426

X ? e (ft/s 2)

0

0

0

Z ? e (ft/s 2)

?11.5

?27.7

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