By Sputnik and 80mileshigh.
Possibly the largest conventionally-powered launch vehicle ever seriously studied, Krafft Ehricke's Nexus was a 120-foot-diameter behemoth that could orbit 1000 tons in a single stage. With an enormous second stage, a complete Mars mission could be orbited in one launch.You MUST INSTALL the Velcro Rockets add-on (www.orbithangar.com/searchid.php) for this add-on to work.