AE2025-AU-Nov11
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Reg. N o. , I I I I I I I I I I I I Question Paper Code 55101 B.E./B.Tech. DEGREE EXAMINATION, NOVEMBER/DECEMBER 2011. Seven th Semester Aeronautical Engineerin g AE 2025 - HELICOPTER THEORY {Regulation 2008) Time: Three hours Maximum: 100 marks Answer ALL questions. PART A - (10 x 2 = 20 marks) 1. Define compound helicopter. 2. State the types of rotor. 3. Name the four elements which rem ain constant when a helicopter hovers. 4. What is autorotation? 5 Define parasite power. 6. Expl;-'in the term 'flapping'. 7 Sketch the category 'A' the vertical take-off profile of the helicopter from pinnacles. 8. What is meant by the term 11igh performance tak e-offs' in helicopter? 9. When is the helicop'er said to be in the trimmed c ondition? 10. Explain the term 'speed stability'.
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Transcript of AE2025-AU-Nov11
Reg. No. , I I I I I I I I I I I I
Question Paper Code 55101
B.E./B.Tech. DEGREE EXAMINATION, NOVEMBER/DECEMBER 2011.
Seventh Semester
Aeronautical Engineering
AE 2025 - HELICOPTER THEORY
{Regulation 2008)
Time: Three hours Maximum: 100 marks
Answer ALL questions.
PART A - (10 x 2 = 20 marks)
1. Define compound helicopter.
2. State the types of rotor.
3. Name the four elements which remain constant when a helicopter hovers.
4 . What is autorotation?
5 Define parasite power.
6 . Expl;-'in the term 'flapping'.
7 Sketch the category 'A' the vertical take-off p rofil e of the helicopter from pinnacles.
8. What is meant by the term 11igh performance take -offs' in helicopter?
9. When is the helicop'er said to be in the trimmed condition?
10. Explain the term 'speed stability'.
PART B - (5 x 16 = 80 marks)
11. (a) Sketch the various configurations of helicopter and explain in detail. (16)
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(b) Name the three impo rtant functions provided he licopter.
by the rotor of a (4)
(ii) Explain the features of the fully articulated rotor system, semi rigid rotor system and rigid rotor system. (12)
J 2, (a) Explain hover Out-of-Ground Effect (DOE) and In-Ground effect (IOE). (16)
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(b) Describe the e ffect of over-pitching while the a hover or du ring a hover.
helicopte r approaching (16)
13. (a) Discuss in detail controlling the cyclic pitch in helicopter with the aid of sketches. (16)
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(b) Explain in detail about autorotation in forward flight of helicopter. (16)
14. (a) Describe the momentum theory for vertical climb of hel icopter. (16)
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(b) Explam the significant changes experienced In the nature of flow through the rotor in vertical descent of the helicopter. (16)
15. (a) Discuss the following parameters governing the static directional stability of the helicopter
(i) Directional stability
(ii) Dihedral effect
(iii) Side fo rce.
0,
State the parameters which affect the rotor thrust.
(8)
(4)
(4)
(3)
(ii) State the parameters which affect the power available to the main rotor.
(iii) Discuss the helicopter.
factors required for maximum efficiency of the (9)
2 55101
(4)
