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If they can get vacuum tubes working cost effectively that would be amazing, no limit to max speeds then. I doubt they are practical currently. Low pressure Hel
by garyclarke27 7y ago
If they can get vacuum tubes working cost effectively that would be amazing, no limit to max speeds then. I doubt they are practical currently. Low pressure Helium Oxygen mixture probably a better option, just enough Oxygen for humans to survive and enough Helium, for say 1/3 atmosphere pressure, would be far easier and cheaper to build/maintain and would still dramatically reduce friction/drag.
- smiley1437 7y agoIsn't helium potentially in short supply? https://www.cbc.ca/news/business/helium-smartphones-fibre-optic-cable-mri-internet-scuba-1.5084212 https://www.cbc.ca/news/business/helium-smartphones-fibre-op... Pressurizing train tunnels with significant amounts of helium which would constantly need to replenished may be impractical
- scarejunba 7y agoThat's just temporary shocks. We have lots of Helium available should we increase use.