Fig. 354.
To cut the hull from a solid block, first prepare the block of the right dimensions, and plane it, making sure that the sides are true and square with one another. The sheer plan must now be transferred to the sides of the block, either by copying it on the wood by the use of transfer paper placed between the drawing and the wood, by cutting out a pattern, or by fastening the drawing itself on one side of the wood and a reversed duplicate on the other side. In the same way transfer the half-breadth plan twice to the top of the block, on each side of a line drawn along the centre, reversing the pattern for one side, of course. Also continue the centre line down each end and along the bottom.
If the top and side outlines can be sawed to the lines marked with a band-saw or jig-saw, the expense will be but slight and considerable labour will be saved. Saw down on the lines 1—1, 2—2, 3—3, etc. (Fig. 354), nearly to the sheer line shown in Fig. 355. In your first attempts at making small boats it may be well to omit the deck sheer, leaving the top flat (Fig. 354), as this simplifies matters in the beginning. Also, saw off the superfluous wood shown by the shaded parts of Fig. 355. Now clamp or wedge the block, bottom up, firmly on the bench, in case you have no vise arrangement by which it can be properly held, and rough it out approximately to shape with a wide chisel (see Paring) or the draw-knife (see Draw-knife).
Fig. 355.
The operation of shaping and hollowing out is slow work and requires much care. A little haste may spoil the work of hours. As the bottom begins to approach the desired shape you must have something more than the eye by which to gauge your cutting, for a very little deviation from the true curve may spoil your boat. It is very important to get both sides of the boat alike. On card-board or stiff paper, mark a series of patterns of the different sections shown on the body plan. Cut out each of these patterns so as to save the part which is the reverse of the shape of the section of the boat, thus forming a series of templates, which you can apply to the hull at each section to test your cutting, until the templates just fit the wood at their respective sections, when the shape of the hull will, of course, agree with the plan.
The spoke-shave, and sometimes the plane, can be used to good advantage in the final shaping (see Spokeshave). Especial care is required not to slice off too much, and you will, of course, work, as a rule, from the centre (or amidships) towards the ends. The block can be held in the lap or between the knees for this shaping, but it is better for all kinds of crooked work to have the material firmly held by a vise or some other contrivance, so that not merely the hands of the worker are free, but the whole body as well.
Fig. 356.