Chapter 6

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Chapter 6

  1. 1. Chapter 6<br />Mast and Flight Controls<br />
  2. 2. Mast supports the main rotor<br />Attached to the main gearbox (transmission) – MGB<br />Absorbs tension and torsion loads<br /><ul><li>Weight of the helicopter
  3. 3. Engine torque</li></ul>Crucial item with finite life<br />Drives swashplate<br />Splines<br /><ul><li>MRH
  4. 4. Stab bar
  5. 5. Dampener bracket
  6. 6. Swashplate drag link
  7. 7. MGB drive</li></ul>Threads<br /><ul><li>Mast nut
  8. 8. Mast bearing</li></ul>Aluminum plug to prevent distortion from mast nut torque<br />
  9. 9. The Mast<br />
  10. 10. Hughes 500<br />Stationary<br />Lighter design<br />Attached to structure of airframe<br />Driveshaft passes through to turn the rotor<br /><ul><li>Splined to MGB and flanged for MRH</li></ul>MRH is supported by tapered roller bearings<br />
  11. 11. 500 Mast<br />
  12. 12. Main Rotor Driveshaft<br />
  13. 13.
  14. 14. Some twin engine helicopters use a mast with a torque meter<br /><ul><li>Measures the twist of the mast
  15. 15. Sensor measures torsional displacement between 2 gears</li></li></ul><li>Torque meter<br />
  16. 16. Bell Helicopters use stabilizer bar<br />Mounted on the mast or trunnion cap<br />If rotor is disturbed by wind gusts stab bar remains undisturbed<br /><ul><li>Gyroscopic rigidity
  17. 17. Helicopter and rotor move
  18. 18. Linkage from stab bar causes blades to feather and return to original position
  19. 19. Bell 47 bars are attached to the mast - splined</li></li></ul><li>Stabilizer Bars<br />
  20. 20. 205 & 212 bars are attached at the trunnion cap<br />
  21. 21. Stabilizer Bars<br />
  22. 22. Stab bar assy will be balanced at O/H<br />
  23. 23. Stabilizer Bars<br />
  24. 24. To control the delay inherent in stab bar utilization dampeners are used to allow the stab bar to move to it’s new plane of rotation at a pre-determined rate.<br />
  25. 25. Stabilizer Dampeners<br />
  26. 26. Timing rate is critical. – Time to return to neutral<br />A soft dampener will result in an over stable helicopter & delayed control response<br />A hard dampener will in an unstable helicopter with quick control response<br />
  27. 27. Timing Rates<br />
  28. 28. Dampeners<br />
  29. 29. Swashplates<br />
  30. 30. Swashplates<br />
  31. 31. Swashplates<br />
  32. 32. Swashplates<br />
  33. 33. Swashplates<br />
  34. 34. Swashplates<br />
  35. 35. Swashplates<br />
  36. 36. Flight Controls<br />
  37. 37. Flight Controls<br />
  38. 38. Flight Controls<br />
  39. 39. Flight Controls<br />
  40. 40. Flight Controls<br />
  41. 41. Flight Controls<br />
  42. 42. Flight Controls<br />
  43. 43.
  44. 44. Flight Controls<br />
  45. 45. Flight Controls<br />
  46. 46. Flight Controls<br />
  47. 47. Flight Controls<br />
  48. 48. Flight Controls<br />
  49. 49. Flight Controls<br />
  50. 50. Flight Controls<br />
  51. 51. Flight Controls<br />
  52. 52. Flight Controls<br />
  53. 53. Flight Controls<br />
  54. 54. Flight Controls<br />
  55. 55. Flight Controls<br />
  56. 56. Flight Controls<br />Fig. 6-36 Dual hydraulic system<br />
  57. 57. Flight Controls<br />
  58. 58. Flight Controls<br />
  59. 59. Flight Controls<br />
  60. 60.
  61. 61. Flight Control Rigging<br />
  62. 62. Flight Control Rigging<br />
  63. 63. Flight Control Rigging<br />
  64. 64. Flight Control Rigging<br />
  65. 65. Flight Control Rigging<br />
  66. 66. Flight Control Rigging<br />

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