1965 NASA study of interplanetary spacecraft powered by nuclear bombs. CVE-Lite compatible, all-purpose interplanetary vessels. Includes 10-meter Mars craft, 20-meter Jupiter/Saturn craft, and chemical-fuel lander.
Bugfix v1.22: I accidentally included AtomicDryad's fork of the Orion20m project as Orion20m.dll. I hadn't intended to do this, as his fork is his, and should be updated at his own pace. v1.22 includes my (no HUD info) version; then, if desired, overwrite with AtomicDryad's latest version of Orion 2011. If that's what you wanted and you've already downloaded v1.21, you're good for now and don't need v1.22.