Marking Off a Strake
- Now place the template onto a timber plank and determine whether this plank is large enough for the strake to be sawn out of it (image 1).
- When selecting the timber plank and when positioning the template make sure that the timber is suitable for creating a strake of this size from it (image 2). The grain of the timber must be in the correct direction, certainly if the strake will subsequently have to be bent (image 3). A plank is unsuitable for this strake if:
- The timber splits at the centre line (image 4).
- The timber contains knots (image 10) at positions where, as a result of bending (image 5), the plank could break or split (image 6).
- The timber has been sawn as quarterlings and shows signs of what is known as sapwood. The unsuitable sapwood can be identified from the useable heartwood by the colour difference and by ‘wood rays’: light-coloured sparkling flames in the timber (image 16). The transition between sapwood and heartwood can be easily seen by lightly planning off the edges of the rough plank (image 14) and (image 15).
- Place the template onto the rough plank in such a way that the part of the strake to be bent the most runs with the long line of the timber grain (image 8).
- Make sure that knots are located as much as possible outside of the strake to be sawn (image 11).
- Start transferring the template to the rough plank by drawing the position of the frames (image 18) and (image 19).
- Now transfer the pinch lines (image 12).
- The fixed distance of all of the measuring points (for example 10 cm) can now be transferred, making sure that you also draw these at right angles (image 9) and (image 17).
- Lay a thin, flexible lath (image 20) along the points that you have marked (image 22), secure the lath using a few panel pins (image 21) and draw the contour of the strake on the rough timber plank (image 23).