General > General Technical Chat
The Hyperloop: BUSTED
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apis:
Japan's L0 Series maglev holds the record with 603 km/h (on a test track), and the Shanghai maglev is the fastest in operation with a maximum normal operation speed of 431 km/h. Transrapid helped build the shanghai one, but it's only east Asia that's investing in maglev.


--- Quote from: nctnico on June 08, 2019, 06:24:04 pm ---Half the pressure means a 50% reduction in the energy lost due to friction (I'll leave it up to the reader to look up the formulas for energy loss due to friction versus air pressure).

--- End quote ---
Not valid in a tube, the capsules will just push the air in front of it. That is why, in the concept art, the hyperloop capsules had large fans on the front that should funnel the air past the capsule.



The fan was probably also supposed to supply high pressure air for the air bearings.
soldar:
Spain's high speed train system is a prestige project which makes no economic sense whatsoever.  The waste and corruption in grand projects like this are a shame in a country where money could be and should be employed more productively.
nctnico:

--- Quote from: apis on June 09, 2019, 12:03:01 pm ---
--- Quote from: nctnico on June 08, 2019, 06:24:04 pm ---Half the pressure means a 50% reduction in the energy lost due to friction (I'll leave it up to the reader to look up the formulas for energy loss due to friction versus air pressure).

--- End quote ---
Not valid in a tube, the capsules will just push the air in front of it.

--- End quote ---
That is just a technical detail which can be mitigated in several ways. The fact a lower air density reduces the amount of energy needed still stands.
apis:

--- Quote from: nctnico on June 09, 2019, 02:22:33 pm ---
--- Quote from: apis on June 09, 2019, 12:03:01 pm ---
--- Quote from: nctnico on June 08, 2019, 06:24:04 pm ---Half the pressure means a 50% reduction in the energy lost due to friction (I'll leave it up to the reader to look up the formulas for energy loss due to friction versus air pressure).

--- End quote ---
Not valid in a tube, the capsules will just push the air in front of it.

--- End quote ---
That is just a technical detail which can be mitigated in several ways. The fact a lower air density reduces the amount of energy needed still stands.

--- End quote ---
If you have two identical tubes with different pressure then a train in the evacuated tube will use less energy. But you were comparing open air to a tube which isn't a valid comparison.
apis:
Swedish politicians consider high speed rail every now and then but every local politician of every little municipality, no matter how tiny the population, demand that the train stop in their village or else they will not let the tracks cross their land. And if it's gonna make a stop every few km it's not going to be high speed. In the Schengen area it might make sense with maglev tracks between the largest cities. :-\
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