# Uncontrolled copy not subject to amendment Principles of

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 High lift devices (flaps)

or Lift augmentation 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 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 Methods of lift augmentation Flaps (trailing edge and leading edge) Slats and slots

Flaps 1. Plain flap 50% increase CLMAX Critical angle 12o

2. Split flap 60% increase CLMAX Critical angle 14o Nimrod

Split flap 3. Slotted flap 65%iIncrease CLMAX Critical angle 16o

4. Blown flap 80% increase CLMAX Critical angle 16o 5. Fowler flap

90% increase CLMAX Critical angle 15o 6. Krueger flap 50% increase CLMAX Critical angle 25o

7. Droop Snoot flap 50% increase CLMAX Critical angle 20o Slats Automatic slat

70% increase CLMAX Critical angle 25o 2. Fixed slat 50% increase CLMAX Critical angle 20o

Slot 40% increase CLMAX Critical angle 20o Flaps

What about drag? Flaps 90 30o 60 Flap

Lift Drag 30o

Large increase Small increase 60o

Small increase Large increase 90o

No sig increase V large increase Any questions?

Questions for you .. 1. What effect does a trailing edge flap have on the stalling speed? a. Higher

b. Lower c. The same d. No difference 2. One type of leading edge flap is: a. Plain

b. Slot c. Split d. Krueger 3. What are some of the high lift devices on the leading edge called?

a. Plain flaps b. Ailerons c. Slats d. Split flaps

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