Intended for use with the Stanford Torus add-on (though it's not absolutely required). Tsiolkovsky is borrowed from Gerard K O'neill's book...it's a solar-powered, mass-driver-propulsion, ferry ship to bring 2000 passengers at a time from LEO to a space colony at L5. Low thrust/weight means you'll fly it at time compression. A unique challenge.
Requires Stanford Torus v1.5 for Orbiter 2010.