Which of the following synthetic fibers is used for covering aircraft?

The correct choice indicates that fiberglass and heat shrinkable polyester fibers are commonly used for covering aircraft. This choice highlights the importance of material properties in aviation applications.

Fiberglass is renowned for its strength, lightweight characteristics, and resistance to environmental conditions, making it a durable option for aircraft coverings. It provides structural integrity and is often used in composite materials to enhance the performance and longevity of aircraft.

Heat shrinkable polyester fibers are also an excellent choice due to their ability to conform tightly to various surfaces when heat is applied. This property helps create a smooth, aerodynamic finish that is essential for minimizing drag and ensuring proper airflow around the aircraft. Additionally, polyester fibers are known for their excellent resistance to UV light, moisture, and overall wear, making them suitable for the harsh conditions that aircraft may encounter during operation.

In contrast, the other options do not possess the optimal combination of durability, weight, and environmental resistance necessary for effective aircraft coverings. Nylon and polyester, while useful in certain applications, do not match the specific properties required for structural aircraft surfaces. Cotton and wool are organic materials that are not typically used due to their susceptibility to rot and degradation in harsh conditions. Similarly, polyethylene and rayon lack the necessary strength and durability required for aviation applications.