Which flight speed should be maintained for optimal climb performance?

Maintaining an optimal climb speed is crucial for ensuring the best climb performance and efficient use of engine power. In this context, the chosen speed of 220 KIAS is typically aligned with the aircraft's performance charts and gives a balance between airflow over the wings and power settings that maximize climb rate.

At this speed, the aircraft is able to achieve an effective climb gradient. It allows for a good combination of lift and drag, ensuring that the aircraft climbs efficiently without sacrificing altitude gain or airspeed unnecessarily. Aircraft performance generally indicates that a slightly higher speed than the minimum control speed (Vmc) is preferable during the climb phase—a range around 200 to 240 KIAS is often used for many jet transports, depending on specific aircraft characteristics and conditions.

The other speeds listed may not align with optimal climb performance for most aircraft. Speeds that are too low could result in inadequate climb performance, while speeds that are significantly higher than what's recommended can lead to decreased efficiency and increased fuel consumption. Thus, 220 KIAS is often the targeted speed for the best climb performance under standard operational conditions.