What is the minimum amount of fabric overlap required for seams in critical airflow areas?

The minimum amount of fabric overlap required for seams in critical airflow areas is 2-4 inches. This requirement is established to ensure that the fabric layers are securely bonded and resistant to potential separation due to the aerodynamic forces encountered during flight. In critical airflow areas, the integrity of the covering is essential for both performance and safety. Adequate overlap helps to improve the strength of the seams and minimizes the risk of fabric failure, which can lead to serious operational issues. Overlapping the fabric by this specified amount creates a robust seam that can better withstand the stresses of flight, thereby enhancing the overall durability and effectiveness of the aircraft's fabric covering system.