What is the stalling speed with flaps up and power off?

What is the stalling speed with flaps up and power off?

• A. 43 knots
• B. 55 knots
• C. 67 knots
• D. 48 knots

Answer: (D)

Stall speed is the minimum airspeed at which the wing can produce enough lift to hold the airplane in level flight for a given configuration and weight. When the aircraft is in its clean configuration—flaps up—the wing isn’t augmented by extra camber, so it requires a bit more speed to reach the critical angle of attack before stalling. In light training airplanes, the clean (flaps up) stall speed is typically around the mid-40s in knots indicated, often about 48 knots. That’s why 48 knots fits as the stall speed with flaps up and power off. The other numbers would correspond to different configurations or weights: flap-down configurations generally stall at lower speeds, while significantly higher speeds wouldn’t align with a clean-stall scenario. Power off is the standard reference since engine power doesn’t materially change the stall speed for a given configuration; it mainly affects climb performance, not the speed at which the wing stalls.

Stall speed is the minimum airspeed at which the wing can produce enough lift to hold the airplane in level flight for a given configuration and weight. When the aircraft is in its clean configuration—flaps up—the wing isn’t augmented by extra camber, so it requires a bit more speed to reach the critical angle of attack before stalling. In light training airplanes, the clean (flaps up) stall speed is typically around the mid-40s in knots indicated, often about 48 knots. That’s why 48 knots fits as the stall speed with flaps up and power off.

The other numbers would correspond to different configurations or weights: flap-down configurations generally stall at lower speeds, while significantly higher speeds wouldn’t align with a clean-stall scenario. Power off is the standard reference since engine power doesn’t materially change the stall speed for a given configuration; it mainly affects climb performance, not the speed at which the wing stalls.