What happens to stall speed when flaps are raised?

When flaps are raised, the stall speed increases. This is because flaps increase the camber and surface area of the wing, which enhances lift at lower speeds. When flaps are extended, they allow the aircraft to fly at slower speeds without stalling, effectively lowering the stall speed. However, when the flaps are retracted (raised), the wing returns to its basic configuration, which reduces lift at lower airspeeds. As a result, the aircraft must maintain a higher speed to achieve the necessary lift to avoid stalling, thus increasing the stall speed.

Understanding this concept is critical for pilots, as it affects flight safety and performance during different phases of flight, especially during takeoff and landing when flaps are commonly used. This awareness helps in making informed decisions about speed management and control when maneuvering the aircraft.