[DavidNJ]

Mathcad does the unit conversion. So if you get the same answer entering '45 lb', '20.412 kg', or '1.399 slug' . Using a MKS check provides a warning if the English units are wrong.

I use ATI dampers, aluminum shell with a steel hub. 6.325" OD with about 6# weight. I believe the other brands are similar in size, weight, and inertia.

Alt+0178 is a superscript ², Alt+0176 is a °.