1. Uncontrolled copy not subject to amendment Principles of Flight Learning Outcome 2 Understand how the stability and manoeuvrability of an aeroplane are controlled Part 2: Explain how flaps, slats and airbrakes are used by an aircraft during landing Revision 2.00

2. High lift devices (flaps) or Lift augmentation

3. High lift devices Objectives: 1.Describe the principle operation of trailing edge flaps 2.State the following for trailing edge flaps: location, effects on lift, effects on drag, types, advantages and uses 3. Describe the principle operation of leading edge slats 4.State the advantages of slats with reference to stalling speed, stalling angle and drag

4. High lift devices Why do we need high lift devices? High lift devices come in many shapes and forms They are mounted on the leading and trailing edges of wings They create more lift at lower speeds to allow lower take-off and landing speeds The aircraft nose will be lower, allowing a better view for the Pilot

5. Methods of lift augmentation Flaps (trailing edge and leading edge) Slats and slots

6. Flaps 1. Plain flap 50% increase C LMAX Critical angle 12 o

9. 60% increase C LMAX Critical angle 14 o 2. Split flap

10. Nimrod Split flap

11. 3. Slotted flap 65%iIncrease C LMAX Critical angle 16 o

13. 4. Blown flap 80% increase C LMAX Critical angle 16 o

14. 5. Fowler flap 90% increase C LMAX Critical angle 15 o

16. 6. Krueger flap 50% increase C LMAX Critical angle 25 o

18. 7. “Droop Snoot” flap 50% increase C LMAX Critical angle 20 o

19. Slats Automatic slat 70% increase C LMAX Critical angle 25 o

20. 2. Fixed slat 50% increase C LMAX Critical angle 20 o

21. Slot 40% increase C LMAX Critical angle 20 o

22. Flaps What about drag? Flaps 30 o Flaps 90 o Flaps 60 o Flap 30 o 60 o 90 o Drag Small increase Large increase V large increase Lift Large increase Small increase No sig increase

23. Any questions?

24. Questions for you …..

25. 1.What effect does a trailing edge flap have on the stalling speed? a.Higher b.Lower c. The same d. No difference

26. 2. One type of leading edge flap is: a.Plain b.Slot c. Split d. Krueger

27. 3. What are some of the high lift devices on the leading edge called? a. Plain flaps b. Ailerons c. Slats d. Split flaps