Which factor does NOT directly affect the performance characteristics of a glider?

The color of the glider does not directly affect its performance characteristics. Performance characteristics, such as lift, drag, glide ratio, and maneuverability, are primarily influenced by factors like weight distribution, wing design, and environmental conditions.

Weight distribution plays a crucial role; how the weight is distributed within a glider affects its center of gravity, which in turn influences its stability and control. Wing design is critical as well, since the shape, size, and aspect ratio of the wings dictate how effectively the glider can generate lift and minimize drag. Environmental conditions, such as wind speed and direction, air density, and thermal activity, significantly impact how a glider performs in the air.

Color, while it may affect heat absorption or signal visibility, does not alter the aerodynamic properties of the glider and therefore has no significant effect on its performance in flight.