B.E-B.E Aeronautical Engineering Flight Dynamics (Sathyabama University, Chennai, Tamil Nadu-2010)
Friday, 23 August 2013 02:00Duraimani
(Established under section 3 of UGC Act,1956)
Course & Branch :B.E - AERO
Title of the Paper :Flight Dynamics Max. Marks :80
Sub. Code :526601/626601 Time : 3 Hours
Date :22/04/2010 Session :FN
PART - A (10 x 2 = 20)
Answer ALL the Questions
1. Define pressure co-efficient.
2. What is stokes flow?
3. What is the function of a leading edge slat?
4. What is V-n diagram?
5. What do you understand by inherently and marginally stable airplane?
6. What do you understand by flying qualities of an aircraft?
7. How is dihedral useful for lateral stability?
8. Explain rudder lock.
9. What is spiral divergence?
10. What is auto rotation?
PART – B (5 x 12 = 60)
Answer All the Questions
11. (a) Mention some methods of reduction of drag of airplane? (4)
(b) Sketch and explain the pressure distribution over an aerofoil for three different angles or incidence? (8)
(or)
12. The overall drag coefficient (based on wing area “S”) of a particular aircraft of weight “w” is given by Cd = a+b CL2, where a and b are constants derive expression for
(a) Minimum drag in horizontal flight.
(b) Magnitude of the dynamic pressure at which this occurs.
(c) The corresponding power required.
13. Derive an expression for the range of jet propelled engine and discuss its implications.
(or)
14. An airplane weighs 1,55,000 w and has a wing plan form area of 90 m2. Its drag polar is of the form.
CD = 0.015 + 0.08 CL2. During cruise at an altitude of 3 km (density = 0.189 kg/m3) its engine suddenly fail and it is forced to descent down in a powerless glide. Calculate.
(a) The maximum glide path angle.
(b) The maximum range covered over the ground run.
(c) The equilibrium glide velocity at that altitude corresponding to minimum glide angle.
15. (a) Derive an expression for free elevator factor and explain its significance of longitudinal static stability.
(b) Write a brief notes on stick force per g.
(or)
16 Write short notes on;
(a) Limits on location of airplane’s centre of gravity. (6)
(b) Power effects on longitudinal stability of a jet aircraft (6)
17. (a) Discuss briefly the consequences of providing excessive dihedral to the aircraft. (6)
(b) Explain the rudder lock and how is it prevented? (6)
(or)
18. (a) Based on strip theory derive an expression for aileron control power. (6)
(b) Discuss the phenomenon of aileron reversal and explain what is meant by aileron reversal speed. (6)
19. Explain the following phenomenon:
(a) Spiral instability.
(b) Phugoid motions.
(c) Pseudo stability.
(or)
20. Discuss in detail the stability derivatives for lateral dynamic.
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