Which equivalent value is used for VD in normal category aircraft?

In the context of normal category aircraft, the equivalent value for VD, which represents the maximum operating speed for turbulent air, is designated as 1.45 times VCmin. This relationship is crucial in aviation because VD helps ensure that the aircraft operates safely within its aerodynamic limits during turbulent conditions.

The value of VCmin refers to the minimum control speed in the aircraft's configuration, and setting VD to 1.45 times this value accounts for a margin of safety. The factor 1.45 is established based on performance and design standards that take into consideration the dynamics of the aircraft under various flight conditions. Using this multiplier allows pilots to maintain control and ensures that the aircraft can handle sudden changes in air pressure or turbulence effectively.

This specific factor aligns well with industry standards and is often used in pilot training and operational guidelines to ensure safety during flight operations. Understanding this relationship helps pilots and engineers make informed decisions about speed limits and performance expectations under different flight conditions.