What is the best rate of climb speed (Vy) for the ERJ 170/175?

The best rate of climb speed, or Vy, for the ERJ 170/175 is indeed 255 KIAS. This speed is critical because it allows the aircraft to achieve the maximum altitude gain over a given period of time, which is particularly important during takeoff and initial climb phases. Maintaining this speed ensures optimal engine performance and efficient lift generation.

This choice aligns with the operational characteristics of the aircraft, particularly given its wing design and engine capabilities, which are optimized for a balance of climb performance and energy management. Flying at Vy helps the pilot avoid the risk of stalling by ensuring that the aircraft remains within a safe margin above its stall speed during climb. By selecting this speed, pilots can effectively manage the aircraft’s climb performance, contributing to safety and operational efficiency shortly after takeoff.