Which option correctly states Vy, the best rate of climb speed?

Which option correctly states Vy, the best rate of climb speed?

• A. 60 KIAS
• B. 58 KIAS
• C. 75 KIAS
• D. 44 KIAS

Answer: (C)

Vy is the speed that gives the greatest climb rate, meaning the most altitude gained per unit time for the airplane in its current weight and configuration. For the DA20-C1 in a typical takeoff/climb setup, Vy is about 75 KIAS at sea level. At this speed the airplane balances enough lift with manageable drag so the engine’s excess power is converted into upward motion efficiently. If you fly slower, you’re approaching stall conditions where drag is high and power is not being used to climb as effectively, so the climb rate drops. If you fly faster, drag increases and you lose climb efficiency, again reducing the rate of climb. So around 75 KIAS yields the highest altitude gain per minute, making it the best rate-of-climb speed. The other speeds listed would produce a lower climb rate or are near stall, which isn’t optimal for climbing.

Vy is the speed that gives the greatest climb rate, meaning the most altitude gained per unit time for the airplane in its current weight and configuration. For the DA20-C1 in a typical takeoff/climb setup, Vy is about 75 KIAS at sea level. At this speed the airplane balances enough lift with manageable drag so the engine’s excess power is converted into upward motion efficiently.

If you fly slower, you’re approaching stall conditions where drag is high and power is not being used to climb as effectively, so the climb rate drops. If you fly faster, drag increases and you lose climb efficiency, again reducing the rate of climb. So around 75 KIAS yields the highest altitude gain per minute, making it the best rate-of-climb speed. The other speeds listed would produce a lower climb rate or are near stall, which isn’t optimal for climbing.