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Not who you're looking for? Others named Helios: Greek god and personification of the Sun · movie theater chain in Poland · 2015 film directed by Longmond Leung and Sunny Luk · statue in London
Helios is a design for a spacecraft propulsion system such that small (0.1 kiloton) nuclear bombs would be detonated in a chamber roughly in diameter. Water would be injected into the chamber, super-heated by the explosion and expelled for thrust. It was a precursor concept to the Orion project. Like Orion, it would have achieved constant acceleration through rapid "pulsed" operation.
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