What is the best rate of climb speed (Vy/Vyse) in KIAS?

The best rate of climb speed, known as Vy or Vyse for multi-engine aircraft, is crucial for achieving maximum altitude gain in the shortest amount of time. Determining the correct value of this speed is essential for flight safety and performance during the climb phase.

In multi-engine aircraft, Vyse is particularly important because it is the speed that gives the highest single-engine climb performance in the event of an engine failure. This speed takes into account the aircraft's weight, configuration, and environmental conditions, and is typically provided in the aircraft's operating handbook.

Option B, which specifies 88 KIAS, aligns closely with common values found in many multi-engine aircraft specifications, making it the most accurate choice in this context. Knowing this speed allows pilots to optimize their performance during critical phases of flight, such as takeoff and climb-out.

Understanding that this value can vary based on specific aircraft models and conditions is important for accurate flight planning and execution. Pilots should always refer to the specific performance data for their aircraft.