Hull planks can contain areas of rot or knots. These have to be removed and repaired. That is what this skill involves.
First we look at what equipment the boat repairer uses for this and then in the second part the successive operations are analysed.
Tools, equipment and machines required for fitting a patch
Pencil and ruler
The circumference of the area of rot or the knot is marked out using the pencil and ruler.
The saw is used to saw out the patch that will be used to replace the area of rot or the knot.
Knife / knives
The knife and chisels are used to remove the area of rot or the knot.
The knot can be chiselled out using sharp chisels and a wooden mallet.
The glue is used to secure the patch or half-lap.
A smooth hull is achieved again by planing the half-lap.
In this example a knot is removed and replaced with a half-lap. The successive operations are described below, step-by-step.