11.1.1 Aerodynamics And Flight Controls Flashcards
Advesrse yaw
Movement of nose in wrong direction at start of a turn
Trim systems
Trimming is maintaining equilibrium without having to use controls
Pitch trimming:
Position of c of g depends on:
• amount of fuel
•distribution of passengers
Yaw trimming:
Needed when uneven amount of thrust
Roll trimming:
Fuel imbalance
Slots:
- improve airflow at high angles of attack and slow speeds
- maintains boundary layer
- on leading edge
Slats
- increase camber
* invrease lift
Stall angle with slats extended :
25 degrees
Most common flap:
Fowler flap
Slotted flap purpose
Rejuvenation of boundary later
Spoilers
“Spoil lift”
Where is the best place on aircraft to stall
Root
Purpose of stall strips
Help root stall first
Balanced control surface:
Simplest form of control aid
Trim tabs
• move in opposite direction to control surface
• adjustable from cockpit
•
Balance tabs
•opposite direction to control surface
• aids pilot in overcoming force needed to move control surface
•
Anti servo/ anti balance tabs
- move in same direction as flight control
- increase force needed to move controls
- decrease sensitivity on controls
Servo tabs:
- used when hydraulic system fails
* backup control system
Spring tabs:
- enables moving control surface when forces are high
- only in effect at high speeds
- springs assist when control force too high at high speeds
Purpose of a slot
Improve airflow at high angles of attack
