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There is a piston. At 2:07 they show a close up of the first stage which they are referring to as the "pump tube", that larger diameter section, where the pisto
by jjk166 5y ago
There is a piston. At 2:07 they show a close up of the first stage which they are referring to as the "pump tube", that larger diameter section, where the piston is driven up to speed, pumping the hydrogen into the second stage barrel at high pressure.
- jhgb 5y agoThere is no piston. Where do you see one? Did you even watch the video? The whole launch sequence is shown there. There's a pressurized hot hydrogen tank that empties into the barrel. There's no "piston [...] driven up to speed, pumping the hydrogen". The hydrogen flows into the barrel on its own because it has high static pressure at the moment of firing. The presenter literally explains it in detail.