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1. AIRCRAFT STABILITY AND CONTROL
6/10/2021 CH.P.RUDESH 1



Lecture By:
Mr.CH.P.RUDESH.
Assistant Professor.

2. SYALLABUS
UNIT-1: Introduction: Objective, scope and outcome of the course.

UNIT-2: General: Degrees of freedom of a system, Static stability, dynamic
stability, Aircraft stability control, simplifying assumptions, axis of reference
and notation, equations of motion, aerodynamic deviations. Longitudinal,
lateral and directional stability and control.

UNIT-3:Longitudinal Stability Stick Fixed:
Basic equations of equilibrium, Stability criterion, Wing and tail moments,
Effect of fuselage and nacelles, Effect of center of gravity (c.g.)location, Power
effects, Stabilizer setting and c.g. location, Elevator effects, stick fixed neutral
point.

6/10/2021 CH.P.RUDESH 2

3. SYALLABUS
UNIT-4: Longitudinal Stability Stick Free:
Hinge moment coefficients, Stick free neutral point symmetric maneuver,
stick force gradients and stick force per g. Aerodynamic balancing of control
surfaces.
UNIT-5: Manoeuvring Stability:
The stick-fixed aspect, stick-free aspect, limitations, longitudinal control,
elevator and trim tab, stick force and stick gearing, variation of stick force
with airspeed, effect of pitching velocity on tail incidence.
UNIT-6: Directional Static Stability and Control:
Vertical tail contribution, fuselage contribution, wing contribution, propeller
effect. Rudder power, yaw damping. Rudder-fixed and rudder free directional
stability, asymmetric power, pedal forces, rudder lock
6/10/2021 CH.P.RUDESH 3

4. SYALLABUS
UNIT-7: Lateral Static Stability and Control:
Effect of wing location, sweep and dihedral, fuselage and vertical tail,
Coupling between rolling and yawing moments; Adverse yaw effects, Aileron
reversal. Lateral control power, Roll damping, directional divergence.
UNIT-8: Dynamic Stability and Control:
Euler angles, Equations of motion, stability & control derivatives. Decoupling
of longitudinal and lateral-directional dynamics, Longitudinal modes, Lateral-
directional modes, Phugoid, Autorotation and spin, Control response, impulse
and step response.
UNIT-9: Aerodynamic Balancing:
The set-back rings, the horn balance, the aileron, the sealed nose balance and
the geared balance tab.
6/10/2021 CH.P.RUDESH 4

5. INTRODUCTION
6/10/2021 CH.P.RUDESH 5

6. AXIS OF REFERENCE AND NOTATION
6/10/2021 CH.P.RUDESH 6

7. INTRODUCTION
6/10/2021 CH.P.RUDESH 7

8. INTRODUCTION
6/10/2021 CH.P.RUDESH 8

9. DEGREES OF FREEDOM
6/10/2021 CH.P.RUDESH 9
•The degrees of freedom (DOF) of a mechanical
system is the number of independent parameters that
define its configuration or state.
•It is important in the analysis of systems of bodies
in aerospace engineering, robotics, and other fields.
•A single rigid body has at most six degrees of freedom
(6 DOF) 3T3R consisting of three translations 3T and
three rotations 3R.
•https://www.youtube.com/watch?v=DdvBrKl3SHg
(DOF)

10. DEGREES OF FREEDOM
6/10/2021 CH.P.RUDESH 10

11. AIRCRAFT STABILITY AND CONTROL
6/10/2021 CH.P.RUDESH 11

12. AIRCRAFT STABILITY AND CONTROL
6/10/2021 CH.P.RUDESH 12

13. AIRCRAFT STABILITY AND CONTROL
6/10/2021 CH.P.RUDESH 13

14. AIRCRAFT STABILITY AND CONTROL
6/10/2021 CH.P.RUDESH 14

15. EQUILIBRIUM STATE
6/10/2021 CH.P.RUDESH 15

16. AERODYNAMIC CENTER
6/10/2021 CH.P.RUDESH 16

17. AERODYNAMIC CENTER
6/10/2021 CH.P.RUDESH 17

18. VARIOUS AOA
6/10/2021 CH.P.RUDESH 18

19. ZERO LIFT LINE
6/10/2021 CH.P.RUDESH 19

20. FORCES AND MOMENT S/M
6/10/2021 CH.P.RUDESH 20

21. FORCES AND MOMENT S/M
6/10/2021 CH.P.RUDESH 21

22. AIRCRAFT CONTROLS
6/10/2021 CH.P.RUDESH 22

23. AIRCRAFT CONTROLS
6/10/2021 CH.P.RUDESH 23

24. AIRCRAFT CONTROLS
6/10/2021 CH.P.RUDESH 24

25. LONGITUDINAL, LATERAL AND DIRECTIONAL STABILITY AND CONTROL
6/10/2021 CH.P.RUDESH 25

26. LONGITUDINAL, LATERAL AND DIRECTIONAL STABILITY
AND CONTROL
6/10/2021 CH.P.RUDESH 26
•Longitudinal stability and control is concerned
with an airplane's pitching motion.
•Lateral stability and control relates to an
airplane's rolling motion.
•And directional stability and control relates to
an airplane's yawing motion.

27. AIRCRAFT STABILITY
6/10/2021 CH.P.RUDESH 27

28. STATIC STABILITY
6/10/2021 CH.P.RUDESH 28

29. STATIC STABILITY
6/10/2021 CH.P.RUDESH 29

30. DYNAMIC STABILITY
6/10/2021 CH.P.RUDESH 30

31. DYNAMIC STABILITY RESPONSES
6/10/2021 CH.P.RUDESH 31

32. DYNAMIC STABILITY RESPONSES
6/10/2021 CH.P.RUDESH 32

33. AIRCRAFT STABILITY
6/10/2021 CH.P.RUDESH 33

34. AIRCRAFT STABILITY AND CONTROL
6/10/2021 CH.P.RUDESH 34

35. AIRCRAFT STABILITY AND CONTROL
6/10/2021 CH.P.RUDESH 35

36. Longitudinal Stability Stick Fixed
6/10/2021 CH.P.RUDESH 36

37. Longitudinal Stability Stick Fixed
6/10/2021 CH.P.RUDESH 37

38. Longitudinal Stability Stick Fixed
6/10/2021 CH.P.RUDESH 38

39. WING CONTRIBUTION
6/10/2021 CH.P.RUDESH 39

40. WING CONTRIBUTION
6/10/2021 CH.P.RUDESH 40

41. WING CONTRIBUTION
6/10/2021 CH.P.RUDESH 41

42. PROBLEM
6/10/2021 CH.P.RUDESH 42

43. TAIL CONTRIBUTION
6/10/2021 CH.P.RUDESH 43

44. TAIL CONTRIBUTION
6/10/2021 CH.P.RUDESH 44

45. TAIL CONTRIBUTION
6/10/2021 CH.P.RUDESH 45

46. TAIL CONTRIBUTION
6/10/2021 CH.P.RUDESH 46

47. TAIL CONTRIBUTION
6/10/2021 CH.P.RUDESH 47

48. TAIL CONTRIBUTION
6/10/2021 CH.P.RUDESH 48

49. TAIL CONTRIBUTION
6/10/2021 CH.P.RUDESH 49

50. TAIL CONTRIBUTION
6/10/2021 CH.P.RUDESH 50

51. TAIL CONTRIBUTION
6/10/2021 CH.P.RUDESH 51

52. TAIL CONTRIBUTION
6/10/2021 CH.P.RUDESH 52

53. TAIL CONTRIBUTION
6/10/2021 CH.P.RUDESH 53

54. TAIL CONTRIBUTION
6/10/2021 CH.P.RUDESH 54

55. TAIL CONTRIBUTION
6/10/2021 CH.P.RUDESH 55

56. TAIL CONTRIBUTION
6/10/2021 CH.P.RUDESH 56

57. TAIL CONTRIBUTION
6/10/2021 CH.P.RUDESH 57

58. TAIL CONTRIBUTION
6/10/2021 CH.P.RUDESH 58

59. TAIL CONTRIBUTION
6/10/2021 CH.P.RUDESH 59

60. LONGITUDINAL STATIC STABILITY
6/10/2021 CH.P.RUDESH 60

61. LONGITUDINAL STATIC SABILITY
6/10/2021 CH.P.RUDESH 61

62. LONGITUDINAL STATIC SABILITY
6/10/2021 CH.P.RUDESH 62

63. AIRCRAFT STABILITY AND CONTROL
6/10/2021 CH.P.RUDESH 63

64. LONGITUDINAL STATIC SABILITY
6/10/2021 CH.P.RUDESH 64

65. LONGITUDINAL STATIC SABILITY
6/10/2021 CH.P.RUDESH 65

66. FUSELAGE CONTRIBUTION
6/10/2021 CH.P.RUDESH 66

67. FUSELAGE CONTRIBUTION
6/10/2021 CH.P.RUDESH 67

68. FUSELAGE CONTRIBUTION
6/10/2021 CH.P.RUDESH 68

69. FUSELAGE CONTRIBUTION
6/10/2021 CH.P.RUDESH 69

70. STATIC MARGIN
6/10/2021 CH.P.RUDESH 70

71. STICK FIXED NEUTRAL POINT
6/10/2021 CH.P.RUDESH 71

72. STICK FIXED NEUTRAL POINT
6/10/2021 CH.P.RUDESH 72

73. STICK FIXED NEUTRAL POINT
6/10/2021 CH.P.RUDESH 73

74. STICK FIXED NEUTRAL POINT
6/10/2021 CH.P.RUDESH 74

75. STICK FIXED NEUTRAL POINT
6/10/2021 CH.P.RUDESH 75

76. LSS
6/10/2021 CH.P.RUDESH 76

77. STICK FIXED STATIC MARGIN
6/10/2021 CH.P.RUDESH 77

78. STICK FIXED STATIC MARGIN
6/10/2021 CH.P.RUDESH 78

79. LONGITUDINAL CONTROL
6/10/2021 CH.P.RUDESH 79

80. LONGITUDINAL CONTROL
6/10/2021 CH.P.RUDESH 80

81. LONGITUDINAL CONTROL
6/10/2021 CH.P.RUDESH 81

82. LONGITUDINAL CONTROL
6/10/2021 CH.P.RUDESH 82

83. LONGITUDINAL CONTROL
6/10/2021 CH.P.RUDESH 83

84. LONGITUDINAL CONTROL
6/10/2021 CH.P.RUDESH 84

85. LONGITUDINAL CONTROL
6/10/2021 CH.P.RUDESH 85

86. LONGITUDINAL CONTROL
6/10/2021 CH.P.RUDESH 86

87. LONGITUDINAL CONTROL
6/10/2021 CH.P.RUDESH 87

88. ELEVATOR HINGE MOMENT
6/10/2021 CH.P.RUDESH 88

89. ELEVATOR HINGE MOMENT
6/10/2021 CH.P.RUDESH 89

90. ELEVATOR HINGE MOMENT
6/10/2021 CH.P.RUDESH 90

91. ELEVATOR HINGE MOMENT
6/10/2021 CH.P.RUDESH 91

92. STICK FREE STATIC STABILITY
6/10/2021 CH.P.RUDESH 92

93. STICK FREE STATIC STABILITY
6/10/2021 CH.P.RUDESH 93

94. STICK FREE STATIC STABILITY
6/10/2021 CH.P.RUDESH 94

95. STICK FREE STATIC STABILITY
6/10/2021 CH.P.RUDESH 95

96. STICK FREE STATIC STABILITY
6/10/2021 CH.P.RUDESH 96

97. STICK FREE STATIC STABILITY
6/10/2021 CH.P.RUDESH 97

98. STICK FREE STATIC STABILITY
6/10/2021 CH.P.RUDESH 98

99. MANOEUVRING STABILITY
6/10/2021 CH.P.RUDESH 99

100. MANOEUVRING STABILITY
6/10/2021 CH.P.RUDESH 100

101. MANOEUVRING STABILITY
6/10/2021 CH.P.RUDESH 101

102. MANOEUVRING STABILITY
6/10/2021 CH.P.RUDESH 102

103. MANOEUVRING STABILITY
6/10/2021 CH.P.RUDESH 103