When I import my kayak model as a surface, I get a design width and length of 3.281 feet. This was imported from a metric design, switched to imperial after importing, observed in the static hydrodynamics results. The prismatic coefficients are way out of range so Kaper fails. This is with v2.6. Any help will be appreciated.
I worked my way around it by exporting it as a fef file, editing the first line with the correct dimensions, the re-importing it. Then the prismatic coefficients seem to be OK although they are less than 0.48 so I can't do anything weith them as I reported in a separate earlier defect.
If your design numbers are bad you can change them at projects->project settings/main dimensions.
I personally don trust Kaper, I was playing with it but switched to Michlet becouse I got the feeling it would be much more accurate. I got funny results with Kaper...