Aerodynamics 100% توقع 2 copy paste ltt

What is the relative wind?

• Same as aircraft heading

• Equal to wind direction

• Opposite to flight path velocity

What is the angle of incidence?

• Angle between chord line and relative wind

• Angle between chord line and longitudinal axis

• Angle between trailing edge and fuselage

What does the aerodynamic force consist of?

• Lift and drag

• Thrust and weight

• Lift and gravity

Where does the aerodynamic force act?

• Center of gravity

• Center of lift

• Center of pressure

What determines lift generation?

• Relative humidity and AOA

• Surface area, profile shape, angle of attack, and dynamic pressure

• Relative speed and gravity

What is the theoretical lift formula?

• Lift = S / ρv

• Lift = ½ × ρ × v² × S

• Lift = q / cL

What happens to lift if velocity doubles and density remains constant?

• Lift halves

• Lift remains same

• Lift quadruples

What is the drag force direction?

• Perpendicular to relative wind

• Parallel to relative wind

• Perpendicular to flight path

What is induced drag caused by?

• Shock waves

• Boundary layer transition

• Lift production and downwash

How can induced drag be reduced?

• Increase angle of attack

• Decrease span

• Increase aspect ratio