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iwwr
on Dec 15, 2014
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A plane that will be able to fly anywhere in the w...
I thought the liquid helium is only for an engine testbed. Production Skylon engines will use liquid hydrogen and oxygen, effectively using their criogenic fuel as a heat sink.
hwillis
on Dec 15, 2014
[–]
No, they use helium still, due to hydrogen embrittlement of the exchanger, but the helium goes to another exchanger with the hydrogen.
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