That introduces a tricky problem that may confound some builders who may not have done this before. The problem is that the keel and the stem have to both occupy the same space before the joint that bonds them together is shaped. This joint must be very carefully shaped to create an effective scarph joint with the two parts correctly aligned. Trying to do this by measurement has a pretty big chance of an error causing a mismatch, with a bad joint the result and possibly having to make a new stem or splice in an extension on the keel.
To accomplish this we needed three battens. These we set up with the keel in position and the ends of the desired scarph marked onto the top and bottom of the keel. Two of the battens are clamped against the frames, one on the aft face of Frame 1 and the other on the front face of Frame 2. Both are vertical and away from the side of the keel by the thickness of a batten. The third batten is clamped to these first two against the side of the keel, in a position that the lower edge crosses the top and bottom faces of the keel at the previously marked lines showing the ends of the scarph. Clamp them all tight so that they cannot move but the keel must be free to move. The template is now complete. Draw a line onto the side of the keel along the lower edge of the third batten, then slide the keel aft out of the way.
|Here is the template set up against the keel. A line is then drawn onto the keel along the bottom edge of the sloping batten, then the keel is slid aft out of the way.|
|The template still in position with the keel out of the way.|
|The template is till in place and the stem has been slid in to replace the keel. The cut line is drawn onto the side of the stem in the same way as was done for the keel.|
|Scarph cut onto front end of the keel, then finished with a hand plane.|
|Keel and stem dry-fitted and clamped to show a near-perfect fit and a nice fair curve.|
|The new scarph joint glued, clamped and excess glue removed. A nice clean joint.|
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