User blog comment:Vivaporius/New project for Conworlds/@comment-1267731-20151007215504/@comment-1927442-20151008002639

Here's a great example of spaceship: https://web.archive.org/web/20060601234257/http://www.aiaa.org/Participate/Uploads/2003-4676.pdf

I think something like that would be possible in one century.