The __________ method of re-covering uses multiple flat sections of fabric attached to the frame whereas the envelope method uses __________ envelopes to cover the aircraft.

The blanket method of re-covering is a process that typically involves using larger flat sections of fabric that are laid over the structure of the aircraft frame. This approach allows for ease of application and is particularly suited for certain types of aircraft that benefit from the simplicity of having fewer seams. In contrast, the envelope method involves using precut or presewn envelopes that are fitted over the aircraft. This technique provides a snug fit and is often used when the aircraft's design requires a more tailored application of fabric.

Using precut or presewn envelopes ensures that the fabric pieces are made to specific dimensions, which can enhance the overall fit and finish of the covering. Additionally, this method can reduce installation time since the pieces are tailored to the aircraft structure, minimizing the need for complex cutting and fitting during the re-covering process.