What is an advantage of using the envelope method to cover fabric aircraft?

The envelope method is a well-established technique for covering fabric aircraft that offers significant advantages, particularly in terms of labor efficiency. This method involves sewing the fabric into an envelope shape where the edges are sewn closed, allowing for a streamlined process.

By utilizing machines to handle the sewing on at least three sides, the labor intensity of the task is notably reduced. This not only saves time but also minimizes the potential for human error during the sewing process. The automation of sewing multiple sides ensures a consistent and reliable seal, reducing the need for extensive manual efforts.

While other factors, like material quality and durability, are important in aircraft covering, the primary advantage highlighted here is the efficiency gained through the use of machinery, which leads to a quicker turnaround compared to purely manual techniques.