Vx stands for which flight performance parameter?

Vx stands for which flight performance parameter?

• A. Stall speed
• B. Best rate of climb
• C. Best angle of climb
• D. Never exceed speed

Answer: (C)

Vx is the speed for the best angle of climb—the speed at which the aircraft climbs most steeply relative to its forward distance. In other words, it gives the greatest altitude gain per unit of horizontal distance traveled. This makes it especially useful for obstacle clearance during takeoff, where you want to climb efficiently toward altitude while minimizing runway use. After clearing obstacles, pilots often move to the speed for best rate of climb to increase vertical speed and gain height more quickly. For comparison, stall speed is the minimum speed to remain airborne, never exceed speed is the maximum structural speed, and best rate of climb (Vy) is the speed that yields the greatest climb rate, not the steepest climb angle.

Vx is the speed for the best angle of climb—the speed at which the aircraft climbs most steeply relative to its forward distance. In other words, it gives the greatest altitude gain per unit of horizontal distance traveled. This makes it especially useful for obstacle clearance during takeoff, where you want to climb efficiently toward altitude while minimizing runway use. After clearing obstacles, pilots often move to the speed for best rate of climb to increase vertical speed and gain height more quickly. For comparison, stall speed is the minimum speed to remain airborne, never exceed speed is the maximum structural speed, and best rate of climb (Vy) is the speed that yields the greatest climb rate, not the steepest climb angle.