Which of the following factors affects the strength requirements of aircraft fabric?

The strength requirements of aircraft fabric are significantly influenced by wing loading. Wing loading is defined as the weight of the aircraft divided by the wing area. A higher wing loading indicates that the wings must bear more weight per unit area, which can lead to greater stress and strain on the materials used, including fabric covering.

The fabric must be able to handle the aerodynamic forces during flight and must maintain its structural integrity under these conditions. As the wing loading increases, the fabric has to be stronger to withstand the additional loads without failing. Therefore, understanding the relationship between wing loading and the strength of the fabric material is crucial for ensuring the safety and performance of the aircraft.

Other factors, while relevant, do not directly affect the fabric strength requirements as much as wing loading does. Aerodynamic drag pertains more to the shape and efficiency of the aircraft design, environmental conditions influence durability but are not directly tied to the static strength requirements, and manufacturer's recommendations are based on established standards that may integrate various factors but are secondary to the physical demands imposed by wing loading.