Woe is I; I made a mistake. I forgot that for displacement, a ton is a long ton and not just 2000 pounds, which is what I’ve been using to convert the numbers in FREE!ship to pounds. With this realization, I’ve had to readjust part 10 for KAPER and the like. It also means that FREE!ship and HULLS calculate displacement so similar that it’s better than good enough for government work. The other good news is that the new KAPER numbers are very very close to the calculations that I did by hand way back at the start of this project. Looks like I still remember geometry and physics. And…