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The speed was primarily the result of an exotic new propulsion system known as a Pulse Detonation Wave Engine, which burned a clean, misted, liquid hydrogen and left a telltale pulse contrail in the sky.
They talked reverently, in whispers, of the upcoming flight, assessing the merits of the liquid hydrogen fuel, the resurrection of the ship’s shield, and the overall design of the Lujexer.
These would burn liquid hydrogen and liquid oxygen from a massive belly-mounted gas tank or External Tank ET.