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1e1a • today at 2:48 AM • 1 reply • view on HN

It looks like they are actually using nitrogen: https://youtube.com/watch?v=22rvpUecLts&t=1134s


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somenameforme • today at 3:46 AM

Air is mostly nitrogen, about 80%. Pure oxygen as you might be thinking, would be quite dangerous - not only for long-term consumption but also in terms of its effects. Oxygen is fuel for fire so a 100% oxygen environment would quite create the pyrotechnic show! The 'white' you see from the exhaust isn't the exhaust itself - nitrogen is obviously colorless, but the moisture in the surrounding air freezing. It's going to be coming out quite chilly to keep the nitrogen liquified ( boiling temp of something like -196F).

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Whoa, was just watching the video (great link btw). People have been debating the specs, but they're shown unambiguously right here. [1] It has 95 kn peak thrust, 6g peak acceleration, pressure of 5500 PSI, and a min operating temp of -200F.

[1] - https://youtu.be/22rvpUecLts?t=1339