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Use of Airbrakes and Approach Control

Use of Airbrakes and Approach Control. Airbrakes and spoilers. Airbrakes create additional drag . The further out they moved, the greater the effect. Airbrakes and spoilers. The high drag reduces the glide performance. Airbrakes and spoilers. ASK13 (in still air) Airbrakes closed 25:1

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Use of Airbrakes and Approach Control

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  1. Use of Airbrakes and Approach Control Don Puttock

  2. Airbrakes and spoilers • Airbrakes create additional drag. • The further out they moved, the greater the effect. Don Puttock

  3. Airbrakes and spoilers The high drag reduces the glide performance Don Puttock

  4. Airbrakes and spoilers • ASK13 (in still air) • Airbrakes closed 25:1 • Airbrakes open 6:1 Don Puttock

  5. Airbrakes and spoilers Speed limiting? • Few gliders have truly speed limiting airbrakes • Many limit the speed to below Vne in a 45° dive or less. • For some gliders the dive angle is less than 30° Don Puttock

  6. Steady 55kt Airbrakes and spoilers The extra drag can cause a decay in airspeed. No Airbrake 38:1 Full Airbrake 8:1 To maintain speed the aircraft must adopt a new attitude. Steady 55kt Don Puttock

  7. Airbrakes and spoilers Opening the airbrakes often have an effect on pitch. ASK13 Brakes Open Brakes Closed Don Puttock

  8. Airbrakes and spoilers Opening the airbrakes often have an effect on pitch. Grob 103 Brakes Open Brakes Closed The pitch change is type dependent Don Puttock

  9. Airbrakes and spoilers The loss in lift caused by opening the airbrakes increases the stalling speed A point worth remembering with a ballooned landing Don Puttock

  10. Airbrakes and spoilers Airbrakes on some gliders will “suck” open Hold the “Blue” lever firmly and once unlocked do not let go, resist any tendency for them to move uncommanded, Don Puttock

  11. Lift Distribution Lift Distribution Airbrakes and spoilers Opening the Airbrakes in high g redistributes the wing bending loads Don Puttock

  12. Airbrakes and spoilers Spoilers disrupt the airflow causing a reduction in lift The spoilers are normally opened against a spring –let go and they close Spoiler Wing Don Puttock

  13. Airbrakes and spoilers Tailchutes increase the drag dramatically Don Puttock

  14. Airbrakes and spoilers Trailing edge brakes Can have a rapid and pronounced effect on speed and pitch Don Puttock

  15. Approach Control Don Puttock

  16. Approach Control Purpose of the approach • To intercept and maintain a 2/3 airbrake approach. • To maintain airspeed through the wind gradient. • To “round out” at a desired location. Don Puttock

  17. Approach Control • Advantages----opportunity to adjust in both directions • Clearing obstacles/landing short. Don Puttock

  18. Approach Control Creeper approach---no margin for error Scraping in over the fence with zero brake is not safe. Don Puttock

  19. Approach Control • Effect of the wind on approach path Don Puttock

  20. Approach Control Effect of wind gradient on speed It why we have additional speed for our approach.(1.4Vs+ ½ wind) Don Puttock

  21. Approach Control Selecting a reference point Don Puttock

  22. Approach Control(Normal) Don Puttock

  23. Approach Control(Normal) Don Puttock

  24. Approach Control(Normal) Don Puttock

  25. Approach Control(Normal) Don Puttock

  26. Approach Control(Normal) ES Normal approach Don Puttock

  27. Approach Control(wrong) Don Puttock

  28. Approach Control(wrong) Don Puttock

  29. Approach Control(wrong) Don Puttock

  30. Approach Control(wrong) Don Puttock

  31. Approach Control(wrong) ES Approach looks right but speed decaying Don Puttock

  32. Approach Control(wrong) Don Puttock

  33. Approach Control(wrong) Don Puttock

  34. Approach Control(wrong) Don Puttock

  35. Approach Control(wrong) Don Puttock

  36. Approach Control(wrong) ES Approach looks right but speed increasing Don Puttock

  37. Approach Control(Undershoot) Don Puttock

  38. Approach Control(Undershoot) Don Puttock

  39. Approach Control(Undershoot) Don Puttock

  40. Approach Control(Undershoot) Don Puttock

  41. Approach Control(Undershoot) ES Undershooting Don Puttock

  42. Approach Control(Overshoot) Don Puttock

  43. Approach Control(Overshoot) Don Puttock

  44. Approach Control(Overshoot) Don Puttock

  45. Approach Control(Overshoot) Don Puttock

  46. Approach Control(Overshoot) ES Overshooting Don Puttock

  47. Approach Control • Top Tips • Longer approaches give you time to settle. • Airbrakes change your rate of descent • Attitude (via the stick) gives you airspeed. • Make few adjustments to the airbrakes---consider before acting. • Select a reference point (RP) Don Puttock

  48. Approach Control(Normal) Don Puttock

  49. Approach Control(Normal) Don Puttock

  50. Approach Control(Normal) Don Puttock

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