By any chance, is there any way to figure out how advanced the technology for "superconductor current capacity" has gotten at THS's tech-level?
I found an article from 1992, at
http://www.sjgames.com/gurps/Rolepla.../MagSails.html , which suggests improvements to a magsail's performance-vs-mass as that factor increases. (THS's spacecraft design system only gives stats for plasma sails instead of magsails, with a thrust-to-mass ratio of 1/400.)
I've also found
https://web.archive.org/web/20060506...2ad/drafts.txt , which provides a third selection of Vehicles-compatible stats for magsails - and this is the only one which mentions a radiation PF.