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Anna University, Chennai-25
B.E. Aeronautical Engineering,
VI (6th, Sixth) Semester
AE340 AIRCRAFT STABILITY AND CONTROL
Time: Three hours
Maximum : 100 Marks
Part A (10 x 2 = 20 Marks)
Answer ALL questions
1. Define static stability and dynamic stability.
2. What do you mean by degree of freedom.
3. What is meant by aileron reversal?
4. What is snaking. Sketch the snaking motion of an aircraft.
5. Difference ranging from stick fixed and stick free.
6. What is meant by `Weather Cock Stability'.
7. What are the condition for longitudinal static stability.
8. How is dihedral useful for lateral stability.
9. What is porpoising mode?
10. What is meant by phugoid oscillation? discuss.
Part B (5 x 16 = 80 Marks)
11 (a) Explain the significance of Routh's discriminant. (8)
(b) Drive an expression for the tail contribution to the pitching moment of an aircraft if it is the wing setting angle and it is the tail setting angle. (8)
12 (a) A wing body model is tested in a subsonic wind tunnel. AL=0 = -1.50, at a = 50, CL is 0.52. At a = 10 and 7.880 CMcg are -0.01 and 0.05 respectively. The C.G location is 0.35c. iw = 0 and tail quantity ratio is 0.34. The tail setting is 2.70 and the tail lift curve slope is 0.1 per degree. e0 = 0 and de/da = 0.35. At a = 80, computed CMcg for the aircraft. (16)
( OR )
(b) i. Discuss in detail the power effects on longitudinal static stability. (8)
ii For the issue in 12, obtain the neutral point location and also static margin. (8)
13(a) Write short notes on
i. Variable incidence tail plane (8)
ii. Adverse Yaw (8)
( OR )
(b) i. What is the coupling ranging from rolling and yawing moments, discuss with suitable examples. (8)
ii. What is the effect of running propeller on directional stability (8)
14 (a) Explain the subsequent Phenomenon
i. Dutch Roll (6)
ii. Spiral instability (5)
iii. Spin (5)
( OR )
(b) Write short notes on
i. Stability derivatives in longitudinal dynamic stability (6)
ii. Stability quartic (5)
iii. Spoils in lateral control (5)
15 (a) An airplane W/s = 3000 N/m2, V = 450 kmph flying at six km attitude has the characteristic formula in longitudinal mode of the form (?2 + ? + 6) (3?2 + ? + 1) = 0. obtain the period and time to dump and comment whether oscillation can be ignored. (16)
( OR )
(b) Write short notes on
i. Tail quantity ratio (5)
ii. Controls of aircraft (6)
iii. Rudder requirement in directional control (5)
Anna University, Chennai-25
B.E. Aeronautical Engineering,
VI (6th, Sixth) Semester
AE340 AIRCRAFT STABILITY AND CONTROL
Time: Three hours
Maximum : 100 Marks
Part A (10 x 2 = 20 Marks)
Answer ALL questions
1. Define static stability and dynamic stability.
2. What do you mean by degree of freedom.
3. What is meant by aileron reversal?
4. What is snaking. Sketch the snaking motion of an aircraft.
5. Difference ranging from stick fixed and stick free.
6. What is meant by `Weather Cock Stability'.
7. What are the condition for longitudinal static stability.
8. How is dihedral useful for lateral stability.
9. What is porpoising mode?
10. What is meant by phugoid oscillation? discuss.
Part B (5 x 16 = 80 Marks)
11 (a) Explain the significance of Routh's discriminant. (8)
(b) Drive an expression for the tail contribution to the pitching moment of an aircraft if it is the wing setting angle and it is the tail setting angle. (8)
12 (a) A wing body model is tested in a subsonic wind tunnel. AL=0 = -1.50, at a = 50, CL is 0.52. At a = 10 and 7.880 CMcg are -0.01 and 0.05 respectively. The C.G location is 0.35c. iw = 0 and tail quantity ratio is 0.34. The tail setting is 2.70 and the tail lift curve slope is 0.1 per degree. e0 = 0 and de/da = 0.35. At a = 80, computed CMcg for the aircraft. (16)
( OR )
(b) i. Discuss in detail the power effects on longitudinal static stability. (8)
ii For the issue in 12, obtain the neutral point location and also static margin. (8)
13(a) Write short notes on
i. Variable incidence tail plane (8)
ii. Adverse Yaw (8)
( OR )
(b) i. What is the coupling ranging from rolling and yawing moments, discuss with suitable examples. (8)
ii. What is the effect of running propeller on directional stability (8)
14 (a) Explain the subsequent Phenomenon
i. Dutch Roll (6)
ii. Spiral instability (5)
iii. Spin (5)
( OR )
(b) Write short notes on
i. Stability derivatives in longitudinal dynamic stability (6)
ii. Stability quartic (5)
iii. Spoils in lateral control (5)
15 (a) An airplane W/s = 3000 N/m2, V = 450 kmph flying at six km attitude has the characteristic formula in longitudinal mode of the form (?2 + ? + 6) (3?2 + ? + 1) = 0. obtain the period and time to dump and comment whether oscillation can be ignored. (16)
( OR )
(b) Write short notes on
i. Tail quantity ratio (5)
ii. Controls of aircraft (6)
iii. Rudder requirement in directional control (5)
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