Indeed as these plans dont have it.. (most of the plans posted in detail are missing something) though in this case that is less an attempt to deliberately lose something as a decision not made. Basically when I last looked at building on the original plans I had decided to taper after completing the stem and false keel under the perhaps mistaken idea that it would be easier.
Perhaps it would be better to mark the taper now and cut it accurately on all pieces..
Just in case here is a revised with the start of the taper marked with a red vertical line...I am cutting corners slightly by making it start just after the joint (in both cases) so if this is very wrong then please say!
Has anyone ever taken a run and automating this? We (and I mean human race) have thousands of these plans in a relatively consistent format. I see no impossible to overcome challenges in creating a tool that can output to formats importable by CAD and creative modelers (MAX etc.), by extracting the station frame curves and positioning them on a correct keel and generating a skinned/solid model. If wer can extract the station frames, we could easily tween the values between station frames to generate the intervening frames.
I'm not saying it would be easy, but I think it's doable, and it seems to me we have enough interested parties and groups that it might be worth doing - imagine there being a library of skinned and solid models with correct hull forms, wales, gunports, would have to draw the line at the head and the stern, too variable and complex. But still if we got that far, modelers, historians, games and movie people, all could access all of these sailing models for whatever purpose they need. And the processing would still require some human input to indicate the correct areas to scan for the curves and which is bow and which is stern, and marking the keel location and length and probably a couple other steps to prime the tool for each unique plan.
Only step I'm iffy on is automated generating of spline-based curves for the station frames, I'm not sure that I know of a product doing that, turning 2d drawings into vector/spline-based lines. I have some idea of companies I could ask who should be able to do it. But also I'll see if I can track this guy down, this was a proposal to do the exact same thing for old rocket parts.(FYI - that's a PDF). This is just the proposal, not clear he did it.
Anyone else know of existing tools/companies/researchers who might find this problem interesting?