Which speed is described as the best rate-of-climb speed?

• A. VX
• B. VY
• C. VS0
• D. VNO

Answer: (B)

Rate of climb is about how fast you gain altitude each minute, i.e., your vertical speed. The best rate-of-climb speed is the airspeed that gives the greatest climb rate by maximizing the surplus power available to climb (power available minus power required). At this speed, the engine’s power and the aerodynamics balance to produce the fastest upward movement. If you fly slower, you’re closer to stall and can’t convert much power into altitude; if you fly faster, drag climbs and the surplus power drops, reducing how quickly you rise. So this speed yields the quickest ascent in time.

For context, the fastest upward path (best angle of climb) is achieved at a slightly lower speed, which climbs more steeply but not as quickly per minute. Stall speed (in landing configuration) is the minimum speed to maintain flight, not a climb performance metric, and the maximum structural cruising speed is the upper limit for normal operation, not about how fast you climb.