M8.3 Lift Augmentation

What is the primary purpose of lift augmentation systems on an aircraft?

• To increase the speed of the aircraft

• To reduce the weight of the aircraft

• To increase lift at a given speed

• To decrease the angle of attack

What effect does a Fowler flap have at a 15° angle of attack?

• It decreases lift by 95%.

• It provides a nose-up pitching moment.

• It provides a nose-down pitching moment with a 95% increase of maximum lift.

• It has no effect.

Why is the high drag of a fully lowered flap useful during landings?

• It increases speed.

• It allows a steeper approach at lower speed.

• It improves fuel efficiency.

How do leading-edge cuffs differ from leading-edge flaps?

• Cuffs are retractable

• Cuffs are fixed aerodynamic devices

• Cuffs decrease CL-MAX

• Cuffs increase maximum cruise airspeed

What is an "adverse pressure gradient"?

• Pressure decreasing towards the wing tip

• Pressure increasing towards the wing root

• Air moving from low to high pressure

• Air moving from high to low pressure

How do vortex generators affect the boundary layer?

• By reducing its energy

• By mixing high-energy free-stream air into it

• By increasing its temperature

• By making it thicker

What is the effect of winglets on fuel consumption?

• Increase fuel consumption

• Reduce fuel consumption

• No effect on fuel consumption

• Double the fuel consumption

What is the impact of winglets on operating costs for airlines?

• Increase operating costs

• No effect on operating costs

• Reduce operating costs

• Double operating costs

What is a result of reduced fuel consumption?

• Increased emissions

• Reduced emissions

• Increased runway length

• Higher speed

How does a slat affect the airflow over a wing?

• It reduces the wing's surface area

• It decreases the lift coefficient

• It delays airflow separation at high angles of attack

• It increases the speed of the airflow