As promised but delayed a bit, I have attached images showing how I calculated taper.
Last photo shows the build stage that I was at when I did the calcs.....all frames in, keel planks and shear planks in per first sketch.
First sketch showing bulhead / frame. Since each frame will be different, first measure the dimension X shown. I did this in mm as this is the easiest.
Next I recorded these dimensions for frames 1-10 plus the stem (bow).
Third image shows my chart. 1st column is frame station. 2nd is dimension in mm.
Jumping to column 5, this shows the taper in percentages. Since frames 5 & 6 are 134mm, the largest distance, this becomes 100%. Then each other frame is calculated for the taper percentage. Example, frame 2 is 110mm divided by 134 mm = 82%. Record these in column 5.
Column 3 shows this in actual plank width. Since I knew that I wanted planks about 8mm, I divided 134 into 16 divisions to give me a starting plank width of 8.37mm. Multiplied 8.37mm times each station % gave me the taper widths. For example frame 8 is 7.2mm.
I took a full plank at 8.37mm and marked the station location by holding it on the hull frames and penciling lines. Then a each frame line I used a caliper to mark my widths. Then it is just connecting the dots and draw a taper line.
Once shaved to the line, I used this plank as a template and marked each plank.
This constant taper worked pretty well until I got down to the last 3 planks on each side. Then I just adjusted the taper to fill the gaps.
It worked out pretty well.....at least I no longer have a Fear of planking!😂😂😂🤣😉