Which speed is referred to as Vno?

Vno is defined as the maximum structural cruising speed. This speed represents the upper limit of the green arc on an airspeed indicator. Flying above Vno can lead to structural stress on the airframe, particularly in turbulent air, as it indicates the maximum speed at which the aircraft can be safely flown in turbulent conditions without risking damage. Understanding Vno is critical for pilots as it helps ensure the aircraft is operated within its design limits during normal flight operations.

The other speeds mentioned in the options serve different purposes. The best angle of climb speed is aimed at achieving the maximum altitude over distance in the shortest time and is crucial during takeoff and initial climb. Rotation speed for takeoff is the speed at which the pilot initiates the rotation of the aircraft for takeoff, ensuring it can lift off safely. Stalling speed in a specified configuration is the minimum speed at which the aircraft can maintain level flight and varies with different configurations (like flaps extended or specific weight). Each of these speeds has its unique importance, but Vno specifically deals with structural limitations during normal flight operations.