Explain the difference between Vy and Vx and when you would use each?

Explain the difference between Vy and Vx and when you would use each?

• A. Vy is best rate of climb (max altitude gained per time); Vx is best angle of climb (max altitude per horizontal distance); use Vx to clear obstacles, Vy for efficient climb.
• B. Vy is best angle of climb (max altitude per horizontal distance); Vx is best rate of climb (max altitude per time).
• C. Vy is the same as Vx; both achieve the same climb.
• D. Vy is best rate of climb (maximum altitude gained per time); Vx is best angle of climb (maximum altitude per horizontal distance); use Vx to clear obstacles, Vy for efficient climb.

Answer: (D)

Vy and Vx describe two different climb-performance goals. Vy is the speed for the best rate of climb, giving the greatest vertical speed (feet per minute). Vx is the speed for the best angle of climb, giving the steepest climb relative to distance traveled (greatest altitude gain per horizontal distance). In practice, you use Vx when there’s an obstacle you must clear on takeoff—the steeper climb helps you gain altitude quickly for a safer obstacle clearance. Once you’re past the obstacle, you switch to Vy to climb efficiently to a higher altitude, achieving the most altitude in the least amount of time. Keep in mind Vx and Vy vary with weight, altitude, and configuration, and the exact speeds come from the aircraft’s POH for your current conditions.

Vy and Vx describe two different climb-performance goals. Vy is the speed for the best rate of climb, giving the greatest vertical speed (feet per minute). Vx is the speed for the best angle of climb, giving the steepest climb relative to distance traveled (greatest altitude gain per horizontal distance).

In practice, you use Vx when there’s an obstacle you must clear on takeoff—the steeper climb helps you gain altitude quickly for a safer obstacle clearance. Once you’re past the obstacle, you switch to Vy to climb efficiently to a higher altitude, achieving the most altitude in the least amount of time.

Keep in mind Vx and Vy vary with weight, altitude, and configuration, and the exact speeds come from the aircraft’s POH for your current conditions.