Stability And Control Flashcards
Static Stability
Driving force on an object that displaced it from equilibrium
Positive Static Stability
Initial tendency to return to equilibrium
Neural Static Stability
Stays in the same place after driving force removed
Negative Static Stability
Initial tendency to diverge
Static Stability on controllability
Higher static stability resists forces from controls less manoeuvrable
Positive Dynamic Stability
Subsequent displacement with time either oscillation to return point or slowly returns to its starting point.
Neutral Dynamic Stability
No damping forces continues oscillating after driving force
Or
Once driving force is removes stays in the same place
Dynamic Instability
Ball continues to be displaces after the driving force is removed
Dynamic stability is associated with which static stability forces
Positive static force required
Dynamic Neutral is associated with what static stability
Static neutral
Static stablility
Dynamic Instability associated with what static stability levels
Static stability
Static instability
Aerodynamic Centre
Point on aerofoil where the size of wing moment remain constant for AOA
Aerodynamic Centre of symmetrical aerofoil
25% chord
Aerodynamic Centre on cambered aerofoil
23%-27% chord depending on cross sectional shape
Absolute Angle of attack
Angle between the RAF and the aerofoil zero lift line
This is usually above the chord line on a cambered wing
