Straight and Level Flight

Question 1

What does the magnitude of lift depend on?

Answer 1

• AOA
• Density
• The velocity of Relative Airflow
• Max plan area of the wing

Question 2

Lift Formula

Answer 2

Lift= Coefficient of Lift (1/2pv^2)S

Question 3

What is the Coefficient of Lift?

Answer 3

Nose atitude in flight (AOA)

-Controlled by elevators

Question 4

How is the 1/2pv^2 controlled in flight?

Answer 4

Throttle

Question 5

In straight and level what must happen to the AOA if you increase speed?

Answer 5

Lower the nose

Question 6

A high wing loading is ideal for?

Answer 6

High Speeds

Question 7

A low wing loading is ideal for?

Answer 7

Low Speeds

Question 8

Max Range=

Answer 8

Min Drag= Min Thrust

Question 9

Factors affecting range….

In a headwind the distnace travlled over the ground is

Answer 9

Reduced

Question 10

To achieve best range in a headwing we must….

Answer 10

Fly at a faster speed than minimum drag

Question 11

In a heavier aircraft the speed to achieve best lift/drag ratio must be….

Answer 11

Higher

Question 12

Best height for Max Range?

Answer 12

Full throttle height

Question 13

What is the Lift/Drag ratio AOA?

Answer 13

4 Degrees

Question 14

What does Max Endurance mean?

Answer 14

Fuel on board must last the longest possible time

Question 15

How to use the least amount of fuel?

Answer 15

Run the engine at the lowest rate

Question 16

Max Endurance=

Answer 16

Min Fuel Flow= Min Power

Question 17

Does wind affect endurance?

Answer 17

NO

Question 18

For Endurance

When weight is increased….

Answer 18

More power is needed and Endurance reduces

Question 19

Best endurance is achieved at what height?

Answer 19

Lowest possible

Question 20

What does the plain flap do?

Answer 20

• Increases effective camber

- Increases lift but also increases drag

Question 21

What is split-flap used for?

Answer 21

• Produces high drag

- Controls airspeed on approach

Question 22

What is Fowler Flap used for?

Answer 22

• Very good lift-producing flap

- Produces an increase in wing area

Question 23

What does a Double-slotted fowler flap do?

Answer 23

• Excellent lift producer

- Further extends the fowler flap

Question 24

What does a Slat do?

Answer 24

• A slat is a small auxiliary aerofoil which increases the coefficient of lift by up to 60%
• Delays stall and wing can operate at much higher AOA

Question 25

When are Slats useful?

Answer 25

At high Angle of Attacks

Question 26

What does a Wing fence do?

Answer 26

• Creates a barrier so that air follows the correct path over the wing
• Improves wing performance
• Allows for a slower approach speed

Question 27

What do vortex generators do?

Answer 27

• Re-energise airflow
• Generate extra lift
• Delay stall

Question 28

Practical benefits of Vortex generators?

Answer 28

• Lower lift-off speed
• Lower stall speed
• Improved control
• Improved low-speed characteristics
• Improved safety