Describe the impact of high-lift devices on stall speed and takeoff/landing performance?

• A. High-lift devices lower stall speed and increase maximum lift, improving takeoff and landing performance but increasing drag in cruise.
• B. High-lift devices raise stall speed and reduce lift.
• C. High-lift devices have no effect on stall speed or takeoff.
• D. High-lift devices only affect climb performance.

Answer: (B)

High-lift devices increase the wing’s lift capability at lower speeds by boosting wing camber and, in some cases, effective wing area. This raises the maximum lift coefficient the wing can achieve, so the airplane reaches the stall at a lower airspeed. That same lift increase lets the aircraft achieve the required lift at slower speeds, which shortens takeoff and landing distances and allows lower approach and climb speeds. The trade-off is added drag when these devices are extended, reducing cruise efficiency, which is why they’re usually retracted for cruise. The idea that high-lift devices raise stall speed and reduce lift doesn’t fit how flaps and slats work; they’re designed to extend lift, not diminish it.