Modifying Lift And Drag

Question 1

List 3 devices used to modify lift and drag

Answer 1

Trailing edge

Leading edge

Spoiler/airbreaks

Question 2

Name a trailing edge device?

Answer 2

A flap

Question 3

What is a flap?

Answer 3

A retractable mechanical device fitted to the edge trailing/leading of the wing

Question 4

What happens when you lower a flap?

Answer 4

The wings curvature increases, increasing the camber. Increases lift.

Question 5

Do flaps increase drag?

Answer 5

Yes

Question 6

What are the benefits of flaps?

Answer 6

Increases drag at lower speeds.

Decreases landing roll as flying at a slower speed.

Question 7

List a few different types of flaps

Answer 7

• Plain flap
• Blown flap
• Split flap
• Fowler flap
• Double slotted flap
• Hawker Sidney trident lift augmentation System
• Boeing 727 loft augmentation System

Question 8

Leading edge devices (such as flaps) decrease the angle of attack (AoA) by how many degrees?

Answer 8

12 degrees or less (average 15 degrees)

Question 9

What are leading edge slots?

Answer 9

Fixed aerodynamic devices on the main planes.

Question 10

Slats/Slots increase the angle of attack by how many degrees? In turn increasing?

Answer 10

Increase the angle of attack to about 20 degrees. Can generate more lift.

Question 11

What effects do the slats/slots have on the nose of the aircraft?

Answer 11

Pitches the nose of the aircraft upwards

Question 12

List the 3 types of slots/slats

Answer 12

Fixed slot
Moveable slat
Leading edge flap

Question 13

What are spoilers?

Answer 13

Small hinged plates in the top portion of wings

Question 14

What do spoilers do?

Answer 14

Disrupt the airflow to increase drag and decrease lift

Question 15

Can spoilers be used to generate rolling motion if deployed on one wing?

Answer 15

Yes

Question 16

With the use of slats and flaps the aircraft can approach at a steeper angle. True or False?

Answer 16

True

Question 17

If an aircraft doesn’t use slats or spoilers what will the aircraft do?

Answer 17

Approach at a shallower angle

Land at a higher speed

Question 18

What are the problems associated with landing fast? (List all 5)

Answer 18

Overheating of breaks/less breaking action

Possible break fire

Possible tire bursts

Possible runway over-run

All of the above

Question 19

What are the problems encountered with taking off without flaps

Answer 19

Shallow take-off angle

Slow rate of climb

Premature Retraction

Full stall close to the ground