The body plan above was drawn from the table of offsets below, developed from observations of several boats seen in the village of Grand Lake Stream, and evolved from the transom-canoes I first saw in western Maine. The main characteristics of the boat represented by the offsets here are :
20′ LOA, 44″ beam to outside of planking, very shallow rocker in keel (approx. 3/4″) over its first 15′ from the bow, with a 4″ rise/tuck to the bottom of the transom over the stern 4′, slight flare in the forward sections, slight tumble-home in the aft sections, 18 1/2″ deep to the inside of the planking, transom 23″ wide by 16″ tall, sections having a shallow arch form.
The dimensions are in inches and sixteenths of inches. The offsets have been lofted at 1/2 scale and corrected with observations made during the construction of the form. Diagonals are as stated. The bottom line labeled ‘ck sum’ is simply the sum of the numbers in the columns, to detect any changes inadvertently made to any value.
My next step is to commit to this design and build a form. The offsets will have to be reduced by the thickness of the ribs, planking, and form material to obtain the stations for the form. Ribs are 3/8″ x 2 1/2″ placed 3 1/2″ OC, planking is 3/16″ x 3″, and the form stations will be covered with 3/4″ x 1″ pine, so the total reduction of the offsets to obtain the form stations will be 1 5/6″.