Lesson 1 Flashcards
The forces acting on an aircraft…
Lift, Drag, Weight, Thrust
What is wing loading?ñ
Weight/Wing area
Allows you to figure out how much lift is needed for the wings to carry the load
What is weight?
Mass * Gravity
What is the center of Gravity?
The balance point of all forces
What is the Angle of Attack?
The angle between the chord line and Relative air Flow
What is the boundary layer?
The layer of air above an object
Few millimeters thick (Thin laminar boundary layer) until transition point (Becomes thicker and more turbulent
Affected by SKIN FRICTION DRAG - reduces relative velocity
What is the separation point?
The point where airflow separates from wing due to increased AOA - leads to a stall
What is the stagnation point?
The location where pressure is relatively zero
What happens at the critical angle of attack
The point where the craft loses all ability to generate lift
Dynamic pressure equation
1/2 * rho * V²
rho = Density
What is “total reaction”?
Real lift
Lift - Drag = Total Reaction
What is the job of the horizontal stabilizer?
Create negative or positive lift to keep CG in stable conditions (Create equilibrium)
Symmetrical Aerofoil
Wings sections are
Mean chord line AOA Leading-edge Chamber (Curvature of wing) Depth of section (Distance from top to bottom of wing) Trailing edge
What is the Angle of Incidence
Angle between Chord line and the longitudinal axis of aircraft
Where is the center of pressure?
Where lift force is generated. Usually behind COG
As AOA increases COP moves forward until hit Critical AOA
moves RAPIDLY BACK
