German Museum of Technology
The Rheinmetall-Borsig Rheintochter RI was a surface-to-air, solid-fuel rocket tested in the last years of World War II. Because of its inadequate altitude ceiling the RI was supplanted by the R III model, a liquid-fuel missile with two side-mounted, solid-fuel boosters. Only six of those were ever launched. Rheintochter means Rhine Maiden.