Straight and Level Flight Flashcards
What does the magnitude of lift depend on?
- AOA
- Density
- The velocity of Relative Airflow
- Max plan area of the wing
Lift Formula
Lift= Coefficient of Lift (1/2pv^2)S
What is the Coefficient of Lift?
Nose atitude in flight (AOA)
-Controlled by elevators
How is the 1/2pv^2 controlled in flight?
Throttle
In straight and level what must happen to the AOA if you increase speed?
Lower the nose
A high wing loading is ideal for?
High Speeds
A low wing loading is ideal for?
Low Speeds
Max Range=
Min Drag= Min Thrust
Factors affecting range….
In a headwind the distnace travlled over the ground is
Reduced
To achieve best range in a headwing we must….
Fly at a faster speed than minimum drag
In a heavier aircraft the speed to achieve best lift/drag ratio must be….
Higher
Best height for Max Range?
Full throttle height
What is the Lift/Drag ratio AOA?
4 Degrees
What does Max Endurance mean?
Fuel on board must last the longest possible time
How to use the least amount of fuel?
Run the engine at the lowest rate
Max Endurance=
Min Fuel Flow= Min Power
Does wind affect endurance?
NO
For Endurance
When weight is increased….
More power is needed and Endurance reduces
Best endurance is achieved at what height?
Lowest possible
What does the plain flap do?
- Increases effective camber
- Increases lift but also increases drag
What is split-flap used for?
- Produces high drag
- Controls airspeed on approach
What is Fowler Flap used for?
- Very good lift-producing flap
- Produces an increase in wing area
What does a Double-slotted fowler flap do?
- Excellent lift producer
- Further extends the fowler flap
What does a Slat do?
- 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
When are Slats useful?
At high Angle of Attacks
What does a Wing fence do?
- Creates a barrier so that air follows the correct path over the wing
- Improves wing performance
- Allows for a slower approach speed
What do vortex generators do?
- Re-energise airflow
- Generate extra lift
- Delay stall
Practical benefits of Vortex generators?
- Lower lift-off speed
- Lower stall speed
- Improved control
- Improved low-speed characteristics
- Improved safety
