ANNA university previous question papers BE – Aircraft stability and control -VI Sem

ANNA UNIVERSITY

AIRCRAFT STABILITY AND CONTROL

B.E. Aeronautical Engineering, VI SEMESTER

 

                                                            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 between 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? Explain.

 

PART B                                      (5 X 16 = 80 Marks)

 

 

11 (a) Explain the significance of Routh’s discriminant.

 

(b) Drive an expression for the tail contribution to the pitching moment of an aircraft

if i? is the wing setting angle and it is the tail setting angle.

 

12 (a)   A wing body model is tested in a subsonic wind tunnel. ?L=0 = -1.50, at ? = 50, CL is 0.52. At ? = 10 and 7.880 CMcg are -0.01 and 0.05 respectively. The c.g location is 0.35c. iw = 0 and tail volume ratio is 0.34. The  tail  setting    is 2.70 and the tail lift curve slope is 0.1 per degree. ?0 = 0 and d?/d? =  0.35. At ? = 80, calculated CMcg for the aircraft.

(OR)

 

(b)  i. Discuss in detail the power effects on longitudinal static stability.            (8)

ii For the problem in 12, find the neutral point location and also  static margin.

 

13(a)Write short notes on

i.            Variable incidence tail plane

ii.            Adverse Yaw

(OR)

 

(b)    i.What is the coupling between rolling and yawing moments, explain with

suitable examples.

ii.What is the effect of running propeller on directional stability

 

14 (a)   Explain the following Phenomenon

i.Dutch Roll

ii.Spiral instability

iii.Spin

 

(OR)

 

(b)   Write short notes on

i.            Stability derivatives in longitudinal dynamic stability

ii.            Stability quartic

iii.Spoils in lateral control

 

15 (a)   An airplane W/s = 3000 N/m2, V = 450 kmph flying at 6 km attitude  has the  characteristic equation in longitudinal mode of the form  (?2 + ? + 6) (3?2 + ? + 1) = 0. Find the period and time to dump and comment whether oscillation can be ignored.

( OR )

      (b)  Write short notes on

i. Tail volume ratio

ii.Controls of aircraft

iii.Rudder requirement in directional control

 

           

1 thought on “ANNA university previous question papers BE – Aircraft stability and control -VI Sem”

Leave a Comment