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to save on fuel cost but spend a lot of money running pumps to keep a tube near vacuum ? these people are insane... just like building a tunnel to drive a car b
by emkoemko 5y ago
to save on fuel cost but spend a lot of money running pumps to keep a tube near vacuum ? these people are insane... just like building a tunnel to drive a car back and forth and pretend like its some new innovation, if only they knew of trains and trains that move underground in tunnels.
- Retric 5y agoCommercial jet aircraft fly at 30,000 feet ~4psi to save on fuel which also translates to higher speeds, which was the joke. Hyperloop was supposed to be lower at ~0.1 psi mostly to allow for higher speeds. As to the effort to maintain a low vacuum, that has relatively minimal associated energy costs assuming the track is reasonably air tight.
- emkoemko 5y agodo you know how hard it is so keep vacuum? let alone massive tubes ? imagine just the temperature differences on day to night cycle and the overall length just look at the energy cost and how much a pump can do in a reasonable time period vs the volume of a large distance tube.