Which speed is associated with best angle of climb?

• A. Vx is the best angle of climb.
• B. Vx is the best rate of climb.
• C. Vx is the stall speed.
• D. Vx is the minimum controllable speed.

Answer: (B)

Best angle of climb is about how steeply you can ascend for a given forward distance. The speed that gives the greatest altitude gain per unit of horizontal distance is Vx, so Vx is the speed associated with the best angle of climb. This is the value you’d use to maximize how quickly you gain altitude without trading too much forward speed, such as when clearing an obstacle after takeoff. In contrast, the fastest rate of climb is achieved at Vy, which maximizes altitude gained per minute but not the steepest climb angle. The other options refer to stall speed or controllability, which are not about climb angle.