Which two types of organic fibers are typically used for aircraft covering?

Cotton and linen are the two types of organic fibers that have been traditionally used for aircraft covering. These natural fibers are valued for their strength, breathability, and ability to absorb moisture, which can be important in various environmental conditions encountered in aviation.

Cotton, for instance, has been a popular choice due to its sturdiness and ease of handling, as it can be easily dyed and treated with various coatings for added durability and weather resistance. Linen, on the other hand, is known for its lower moisture retention, which helps prevent rot and mildew, making it beneficial for aircraft in humid conditions.

While other materials like silk and wool are organic, they do not have the same historical or practical application in aircraft covering due to durability and maintenance considerations. Synthetic fibers like polyester and nylon, although strong and lightweight, fall outside the category of organic fibers, and therefore do not apply to this question. Rayon and fiberfill also do not meet the criteria of organic fibers traditionally used in aircraft coverings.