What type of patch is not typically used for larger repairs on plywood skin?

Splayed patches are not typically used for larger repairs on plywood skin due to their design and application limitations. These patches are generally used for smaller areas where stress distribution is less critical. Their tapered edges make them effective for seamlessly blending with the surrounding material, but this shape does not provide the structural integrity necessary for larger repairs.

In contrast, scarfed patches are designed specifically for larger repairs and involve cutting a slope into both the patch and the surrounding material, which allows for a gradual transition and better load distribution. Plug patches involve cutting out a section of the skin and replacing it with a piece of the same material, providing strong support and durability for substantial damage. Surface patches adhere to the surface and are used for repairs that do not require full structural integration, yet they can be designed for larger areas than splayed patches.

Understanding the distinctions in patch types helps in selecting the right technique for ensuring the structural integrity and longevity of plywood skin repairs.