34856Re: "Lofting" side panels
- Mar 4, 2004My guess is that most boatbuilders will abandon the loftwork as soon
as the frames have been fabricated and set up. At that point, it's no
longer a matter of what the designer had in mind, and more a matter
of what size and shape the frames actually are. In other words, the
shape would be taken from the frames, not from the planking. You
might try to get your hands on the WoodenBoat article on the building
of the Whittholz-designed Downeaster v-bottom powerboat. It shows how
to build a non-instant plywood boat about as well as anything.
I would set up the frames, rightside up, or upside down, as prefered.
To get the shape for the planking, I would take the shape from the
frames by making up a plank about 4" wide that is stiff enough and
pliable enough to make a fair curve. (e.g. 3/8" ply) It should be
long enough to go from stem to stern. Mount it temporarily along the
mid-point of the side plank. Then, at each frame, draw a line across
the 4" piece showing the angle at which the frame crosses it, and
measure the length from some mark to where the edge of the plank
needs to fall, both above and below.
Then to mark the planking, lay the marked piece on the stock. Extend
the lines marking where the frames will cross, and measure to where
the edge needs to fall. You can then draw a fair line along the
edge. ("Voila!," Peter might say.) I would leave an allowance for
find adjustment later.
This is basically the way a plank would be spiled for lap or carvel
construction. Perhaps you need a book? Chapelle's Boatbuilding or
Sewards' Boatbuilding Manual.
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