I’m starting construction of the stem and knee by making sure that I have these parts drawn correctly on the full size drawing (lofting). After cutting out the stem and knee, the challenge will be to carve out a rabbet that will receive the planking. It’s important to note that the lofting shows the profile view (side view) and half-breath view (top view of half the boat) on the same drawing. The rabbet line is determined early in the lofting and is drawn in the profile view using a batten to establish a fair curve from the tip of the boat to the bottom keel. As detailed as this may seem to be, I’m not 100% confident that the rabbet will be perfect if I carve it all out on the bench from these measurements. When trying to work out how to fit the keel to the stem knee on the drawing, I realized that my original drawing of the stem profile was off. By subscribing to the RSS feed you will be notified when new entries are posted on this blog. DISCLAIMER: Any posts on LJ are posted by individuals acting in their own right and do not necessarily reflect the views of LJ.

The light grey lines are waterlines for the profile view and the blue lines are water lines for the half-breath view.
The bearding line is determined from the angles of the planks at different points where they intersect with the stem. I’m trying to decide if I should carve out just the top section on the bench and complete the bottom section after I put the stem in place and can do some test fitting and final carving with everything up on the molds. For example, working with the relationships between the different views of the boat was very difficult at first. These waterlines represent heights every 3 inches and are very much related to each other to determine the overall shape of the boat. The keel would have had to curve up sharply to meet the stem and other parts wouldn’t fit according to the plan, such as the mast step. I think I owe this to reading, practice, writing this blog and getting some tips from others on here.
These lines are like a contour map of the hull and meet the center stem at different heights and angles.

For example, the lowest blue line shows how the outside of the plank will meet the stem at the rabbet line at a height of 6”.
Fortunately, the changes were slight enough that they had no effect on the rest of the drawing including the station molds, which I had already built. Next time, I think it would be a good idea to add more details earlier in the lofting to make sure everything fits before cutting any actual wood. Using a square, I then placed a mark on the profile view at the same point 6” in height on the stem to indicate where the bearding line should be for that point.

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Comments to “Building boats stem activity”

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