What is the maximum speed at which an airplane can be operated in smooth air known as?

The maximum speed at which an airplane can be operated in smooth air is referred to as Vno, also known as the maximum structural cruising speed. This is the speed that should not be exceeded during turbulent air as it provides a safe margin for maneuvering without risking structural damage to the aircraft.

Vno is indicated on the airspeed indicator and is a critical speed for pilots to understand, as it marks the upper limit for normal operations in turbulence. Exceeding this speed can lead to overstressing the airframe, especially in turbulent conditions, making it essential for pilots to adhere to this limit to maintain safety.

Maneuvering speed, Vne, and Vy serve different purposes. Maneuvering speed is the speed at which a pilot can safely maneuver the aircraft without stalling, Vne is the never exceed speed beyond which the aircraft should not be flown for safety reasons, and Vy is the best rate of climb speed. Each of these speeds has specific roles in flight operations, but when it comes to the maximum speed in smooth air, Vno is the appropriate term.