Which of the following factors is NOT one of the four that govern the strength of vortices?

• A. Wingspan
• B. Wing shape
• C. Aircraft color
• D. Weight

Answer: (C)

The strength of vortices created by an aircraft during flight is influenced by several physical characteristics, primarily those related to the aircraft’s design and performance. Among these, the wingspan is significant because a larger wingspan generally produces stronger wake turbulence due to the increased area over which lift is generated. Similarly, the shape of the wing can affect how air flows over the surface, influencing vortex formation. The weight of the aircraft is also crucial, as heavier aircraft generate stronger vortices due to the greater lift required for their mass.

In contrast, the color of an aircraft does not have any physical effect on the aerodynamics or the generation of vortices. While it may affect factors like visibility and heat absorption, it does not play a role in the mechanics of how vortices are created, maintained, or dissipated. Therefore, this characteristic is not one of the four primary factors that govern the strength of vortices.