How do you calculate the size of a patch needed for a hole in the hull?

To calculate the size of a patch needed for a hole in the hull, it's essential to accurately measure the hole's dimensions. This precise measurement is crucial because the patch must cover the hole completely to prevent any further water ingress. Additionally, adding extra material beyond the hole's dimensions is necessary to ensure that the patch can be securely fastened around the edges, providing a solid seal. This approach ensures that the integrity of the hull is maintained and that the repair will effectively withstand stress and pressure.

Measuring the hole and allowing for extra material is the most reliable method for determining the correct patch size, ensuring both safety and effectiveness in the repair process.