Aetheric Tractors
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The 'Atheric Tractor is a class of technologies that make use, usually, of spinning masses of coronium within appropriate magnetic fields in order to enact a force against the Luminiferous Aether, in a manner often analogized to a propeller against a fluid. This provides massless drive to starships and space stations employed by the Star Empire of Galba Roy, allowing them to even occasionally void normal rules of orbital mechanics (such as geostationary orbits at any altitude) provided sufficient drive and fuel.
Their relative ease of manufacture and maintainance, and their compatibility with equally simple phlogistonic energy sources, make them a popular (indeed, the standard) choice for ships' sublight drives according to the Admiralty Register.