Control surfaces — Transcript

Full transcript

1. 0:08[Music]
2. 0:11The pilot flies an aircraft manipulating
3. 0:13controls that are linked to devices
4. 0:15which are called control services.
5. 0:21[Music]
6. 0:32The wing produces upwards facing lift as
7. 0:34it flies through horizontally facing
8. 0:36air. So for a set air speed, how can the
9. 0:40wing generate more lift? You can split a
10. 0:43section of the wing into a separate
11. 0:45surface like
12. 0:47this. Hinged and able to move up and
13. 0:50down. One such surface is called an
14. 0:52aileron.
15. 0:54As the aileron moves down, the wing's
16. 0:57camber is
17. 0:58increased. This results in further
18. 1:00reduced static air pressure above the
19. 1:03wing and combined with extra deflection
20. 1:05of the air flow underneath, the outcome
21. 1:08is more lift. Conversely, the lift is
22. 1:12reduced when the aileron moves
23. 1:15up. Another example is the rudder, which
24. 1:18works in similar fashion to an aileron
25. 1:20as it moves left or right.
26. 1:24With each movement, it essentially
27. 1:25produces side-f facing lift force due to
28. 1:29increased camber and deflected air
29. 1:32flow. The ailerons function in
30. 1:35opposition. As one moves up, the other
31. 1:38moves
32. 1:39down. The pilot uses the control column
33. 1:42to operate the ailerons by turning it
34. 1:45right or
35. 1:46left. The primary effect is a roll about
36. 1:50the aircraft's center of gravity.
37. 1:54The pilot uses rudder pedals to operate
38. 1:56the rudder. Pressing the left pedal
39. 1:59moves the rudder left and the primary
40. 2:02effect is a yaw to the left. The right
41. 2:05rudder ys the aircraft to the
42. 2:10right. The aircraft model in this
43. 2:13demonstration is fitted with a
44. 2:15stabilator which is a one-piece design
45. 2:17of an elevator. The pilot uses the
46. 2:20control column to operate this control
47. 2:23surface by pushing it forward or pulling
48. 2:26it back. As the stabilator moves up or
49. 2:29down, it deflects the relative air flow
50. 2:32and causes the aircraft to pitch up or
51. 2:35down about its center of
52. 2:37gravity. Finally, there is power. The
53. 2:41pilot controls the aircraft's power by
54. 2:43the throttle control.
55. 2:45For example, more power generated by the
56. 2:49propulsion system produces the obvious
57. 2:51primary effect of more air speed.
58. 3:01[Music]