Which speed yields the most gain in altitude in the least amount of time?

• A. Best Rate of Climb (Vy)
• B. Best Glide
• C. Best Angle of Climb (Vx)
• D. Vmo

Answer: (A)

In climb performance, the speed that gives you the most altitude per unit time is the Best Rate of Climb. That speed is chosen to maximize climb rate, which is the vertical speed the airplane can achieve (feet per minute). It represents the greatest amount of excess power available to convert into upward motion, so you gain altitude fastest for a given weight and configuration.

Choosing this speed means you’re prioritizing how quickly you rise, not how steeply you rise or how far you can go forward. If you needed the steepest climb for a given horizontal distance to clear obstacles, you’d use the Best Angle of Climb. The Best Glide speed is about descent efficiency (minimum sink), and Vmo is simply the maximum operating speed, not a climb-performance target.