First, definitions of world ships from the literature are revisited and the notion of world ship positioned with respect to similar concepts such as generation ships. This article revisits some of the key feasibility issues of world ships. Despite their emergence in the 1980s, most of these topics remain unexplored. Due to their crewed nature, size and long trip times, the feasibility of world ships faces an additional set of challenges compared to interstellar probes. World ships are hypothetical, large, self-contained spacecraft for crewed interstellar travel, taking centuries to reach other stars. Further information on the history and design of the Enzmann Starship is invited so that this concept can take its rightful place in the history of interstellar spacecraft design proposals. In this paper the engineering configuration is described, and a performance assessment is given in the context of modern scientific knowledge. This paper sets out to reliably describe what is known about the Enzmann Starship design and also how the idea originated, based upon what is known to date. Very little has been written about the concept in the academic literature and no modern assessment of its engineering credibility exists. Although the Enzmann Starship is relatively well known in science fiction circles, it is not well known within the interstellar research community and indeed just as little is known about its creator, Robert Enzmann. Stine envisioned the Starship to be part of a wider programme of interstellar exploration, beginning in the 1990s. Harry Stine, presented the concept to a wider audience via ``Analog Science Fact & Science Fiction '' magazine in 1973. The spacecraft was to be manned by a small community of people setting out to colonise nearby stars and the entire vessel would have a launch mass of between 3-12 million tons, most of which would be the propellant. In the 1960s he was heavily involved in space-mission design and introduced the concept of a fusion powered interstellar spacecraft design which utilised a 305 m diameter sphere of frozen Deuterium and a long cylindrical habitat/propulsion section joined onto it by a connecting structural column. During his student days Robert Duncan-Enzmann imagined a space vehicle design which he depicted in a watercolour painting and apparently dated 1949.
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