Modifying Lift And Drag Flashcards
List 3 devices used to modify lift and drag
Trailing edge
Leading edge
Spoiler/airbreaks
Name a trailing edge device?
A flap
What is a flap?
A retractable mechanical device fitted to the edge trailing/leading of the wing
What happens when you lower a flap?
The wings curvature increases, increasing the camber. Increases lift.
Do flaps increase drag?
Yes
What are the benefits of flaps?
Increases drag at lower speeds.
Decreases landing roll as flying at a slower speed.
List a few different types of flaps
- Plain flap
- Blown flap
- Split flap
- Fowler flap
- Double slotted flap
- Hawker Sidney trident lift augmentation System
- Boeing 727 loft augmentation System
Leading edge devices (such as flaps) decrease the angle of attack (AoA) by how many degrees?
12 degrees or less (average 15 degrees)
What are leading edge slots?
Fixed aerodynamic devices on the main planes.
Slats/Slots increase the angle of attack by how many degrees? In turn increasing?
Increase the angle of attack to about 20 degrees. Can generate more lift.
What effects do the slats/slots have on the nose of the aircraft?
Pitches the nose of the aircraft upwards
List the 3 types of slots/slats
Fixed slot
Moveable slat
Leading edge flap
What are spoilers?
Small hinged plates in the top portion of wings
What do spoilers do?
Disrupt the airflow to increase drag and decrease lift
Can spoilers be used to generate rolling motion if deployed on one wing?
Yes
With the use of slats and flaps the aircraft can approach at a steeper angle. True or False?
True
If an aircraft doesn’t use slats or spoilers what will the aircraft do?
Approach at a shallower angle
Land at a higher speed
What are the problems associated with landing fast? (List all 5)
Overheating of breaks/less breaking action
Possible break fire
Possible tire bursts
Possible runway over-run
All of the above
What are the problems encountered with taking off without flaps
Shallow take-off angle
Slow rate of climb
Premature Retraction
Full stall close to the ground
