Vy stands for which flight performance parameter?

Vy stands for which flight performance parameter?

• A. Best angle of climb
• B. Maneuvering speed
• C. Stall speed
• D. Best rate of climb

Answer: (D)

Vy is the airspeed for maximum rate of climb, the speed at which the airplane gains the most altitude in the shortest time. This is the best way to describe Vy because it is defined as the speed that provides the greatest vertical speed, or climb rate. At this speed the airplane has the largest excess power (power available minus power required), so the climb rate is maximized. If you fly slower, climb rate drops because although lift is high, you don’t have enough excess power to climb quickly; if you fly faster, drag rises and the engine can’t convert the extra airspeed into altitude as efficiently. Vy changes with weight and altitude, since heavier weight and thinner air alter the power required and available. For context, other common climb speeds include the best angle of climb for gaining height over a short distance, stall speed, and maneuvering speed, which relate to different performance criteria.

Vy is the airspeed for maximum rate of climb, the speed at which the airplane gains the most altitude in the shortest time. This is the best way to describe Vy because it is defined as the speed that provides the greatest vertical speed, or climb rate. At this speed the airplane has the largest excess power (power available minus power required), so the climb rate is maximized. If you fly slower, climb rate drops because although lift is high, you don’t have enough excess power to climb quickly; if you fly faster, drag rises and the engine can’t convert the extra airspeed into altitude as efficiently. Vy changes with weight and altitude, since heavier weight and thinner air alter the power required and available. For context, other common climb speeds include the best angle of climb for gaining height over a short distance, stall speed, and maneuvering speed, which relate to different performance criteria.