Why do airplanes extend wing flaps that increase the area and the angle of attack of the wing du

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Why do airplanes extend wing flaps that increase the area...

Key Concepts

Cruise Efficiency

At cruising speed, the aerodynamic efficiency of an aircraft is optimized by minimizing drag. Retracting the flaps during cruise reduces unnecessary drag, allowing the plane to sustain higher speeds and better fuel efficiency while maintaining stable flight.

Angle of Attack

Extending flaps effectively increases the wing’s angle of attack and camber, which enhances the lift produced at a given airspeed. This change in the wing's aerodynamic profile is especially beneficial during phases of flight where speed is low and a higher lift coefficient is needed.

High-Lift Devices

Wing flaps are a type of high-lift device used to modify the wing's shape and increase its effective area, allowing an aircraft to generate more lift at lower speeds. This is particularly essential during takeoff and landing, where additional lift is necessary to safely become airborne or maintain controlled descent.

Lift and Drag Trade-off

Deploying flaps increases lift by altering the airflow over the wing, but this comes at the cost of increased drag. During low-speed flight phases like takeoff and landing, the benefit of extra lift outweighs the drawback of higher drag. In contrast, during cruising, reduced drag is crucial for fuel efficiency and optimal performance.

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